Chicken Fajita Casserole is a super delicious and EASY Mexican recipe! Full of all your favorite classic fajitas flavors, but it's a tasty casserole. Yum. Only 8 ingredients and one pan from stovetop to oven. This keto chicken fajita casserole recipe is family-friendly.
🎥 Watch Video
You'll ❤️ Baked Chicken Fajita Casserole
"This chicken fajita casserole recipe is amazing!! My whole family LOVED it. It will even be a hit with non-keto people. Thanks! " -Shannon, Pinterest
Love fajitas? Be sure to try this Chicken Fajita Soup that can be made in your Instant Pot, crockpot, or on the stove. I also have this Instant Pot Chicken Fajitas recipe with delicious Mexican-style rice. Enjoy!
Classic Fajitas - But It's a Casserole
Classic stovetop fajitas turned into a delicious casserole that your whole family will love. Tender chicken with homemade fajita seasoning, blended with shredded cheese and veggies makes the perfect dinner. Serve with a side of cauliflower rice or tortillas for the rest of your family.
This easy Chicken Fajita Casserole is a perfect weeknight meal to make (weekends are good too! LOL). Only 8 ingredients, can you believe it? I think it's total comfort food. Comfort food is great during a crazy weeknight don't you think? 🙂
One Pan Skillet Dinner
While you can use any oven-proof skillet, I love to use my cast-iron skillet for this chicken fajita casserole. If you don't have a cast iron skillet, transfer to a baking dish.
Keto Chicken Recipe
With healthy fats and low carb vegetables, keto chicken fajita casserole is a great option if you follow a ketogenic diet.
You can increase healthy fat content by adding avocado or cooking in additional olive oil. You can also substitute chicken thighs for chicken breasts.
🥘 What You'll Need
Here are the ingredients you will need to make this healthy chicken fajita casserole.
Chicken Thighs - boneless skinless thighs, but you can also use chicken breast too!
Bell Peppers - use any favorite color. I love using different colors.
Yello Onion - While I used a yellow onion, you could also use a sweet, white, or red onion.
Homemade Fajita Seasoning Recipe or Copycat Taco Seasoning Mix Recipe - you can use either healthy seasoning mix. I highly recommend you make your own seasoning mix - it's easy, inexpensive, and much healthier than store-bought.
Shredded Cheddar Cheese - use mild or sharp shredded cheese - whichever you prefer. Substitute pepper jack cheese if you it spicy!
Optional for Serving: avocado slices, shredded cheese, guacamole, fresh cilantro, or salsa. Don't forget hot sauce for the spicy lovers! 🙂
For exact ingredient quantities, please see the recipe card below!
🔪 How To Make It
Here's how to make this easy chicken fajita casserole:
Cook The Chicken
Make the homemade fajita seasoning or taco seasoning.
Preheat the oven to 350 degrees F.
Preheat olive oil in an oven-proof skillet over medium heat. Saute the chicken thighs (or chicken breast) until done.
Tip: the safe cooking temperature of chicken is 165º
Remove the chicken from the skillet and set it aside.
Saute Onion and Peppers
Add onions and peppers and saute until tender, about 3 to 5 minutes, or until cooked to your desired tenderness.
Add The Seasoning
Add chicken back to the pan.
Stir in the fajita seasoning, sour cream, and cream cheese. Mix well.
Sprinkle the top with the shredded cheddar cheese and bake in the oven for 15 to 20 minutes or until cheese is bubbly.
🥗 How To Serve It
Here's how to serve this easy chicken fajita casserole:
"I love this warm flavorful, slightly spicy, chicken fajita casserole balanced with the cold crisp freshness of a simple green salad. " -Kori
Meal idea! Serve chicken fajita casserole on its own, with cauliflower rice, or in flour or corn tortillas (or a low carb keto equivalent). Serve a simple fresh side salad with Avocado Dressing.
Top with avocado slices, sour cream, salsa, Chipotle Crema, or Roasted Chili Corn Salsa for added freshness.
💭 Top Tips
- Use boneless chicken thighs or breasts that have been cut into uniform sizes (approx 1" to 2" in size, or you can do 1.2" strips if you prefer)
- Cook the onions and peppers to your desired tenderness. Some people love them crisp-tender; others love them completely soft.
- Cook the chicken to 165º - the safe internal cooking temperature.
- Since most of the recipe is cooked, you only need to bake the casserole to get the cheese bubbly and heat the inside. No more, no less. 🙂 Technically, you don't even have to bake this casserole, but you won't have that nice ooey gooey melted cheese on top!
- If you don't have an oven-proof skillet, just cook chicken, peppers, and onion according to the recipe. Stir in the dairy. Put the mixture into a casserole baking dish, then top with shredded cheddar cheese and bake.
The USDA recommends that chicken should be cooked to 165º degrees. I always check the temperature of my chicken with an instant read thermometer. Here is a link to their Safe Minimum Internal Temperature Chart.
Typically people top their fajitas with shredded cheddar cheese, sour cream, salsa or taco sauce, and avocado slices or guacamole. Of course, this is all a personal preference!
Chicken fajitas are very healthy! With plenty of nutrients, healthy fat, protein, and fiber you will feel satisfied long after your meal is over.
Amazingly, each serving of this chicken fajita bake (keto low carb) has over 100% of your day's vitamin C, 35% Vitamin A, 30% zinc, 23% calcium, and is loaded with Vitamin B's! 48% Vitamin B12, 45% Vitamin B6, 44% Vitamin B3, 41% Riboflavin B2.
Where are all these vitamins coming from? Well, the fats are coming from the chicken, olive oil, cheese, and sour cream. The calcium is mostly coming from the cheese and sour cream, but the bulk of the remaining B's, Vitamin A , and Zinc, are coming from the bell peppers.
Here's a super interesting article about peppers from WebMD:
Pepper Power: Nutrition and Other Benefits
Can I Freeze Chicken Fajita Casserole?
Yes, definitely! That's one of the best things about this casserole. You can portion out meals, and freeze it in airtight containers for up to 3 months. Thaw in the refrigerator before reheating.
Chicken Fajita Bake makes amazing leftovers for lunch!! So much flavor and a great change-up from soup and sandwiches.
How Do You Cut Chicken Breast for Chicken Fajitas?
For traditional fajitas, cut chicken breast into thin 1/2" strips sliced horizontally, cutting against the grain.
Keep in mind that the smaller the pieces, the quicker they will cook so you may need to shorten your cooking time as recommended by the recipe instructions.
✔️ More Mexican Recipes
Here are some delicious dishes to make! I've included a mix of Mexican-inspired keto chicken recipes, as well as beef, and even shrimp tacos!
- Zucchini Ground Beef Taco Casserole - one of the best taco casserole recipes!
- Chicken Fajita Soup (Crockpot + Instant Pot) - Fajita flavor packed into a heart creamy soup!
- Birria Tacos with Consommé - serve this as a stew! So delicious.
- The Best Low Carb Keto Shrimp Tacos - Oh how I love these. Super easy and quick to make.
- Low Carb Chicken Enchiladas (Keto Zucchini Enchilada Boats) - these are a fun way to use up all the zucchini coming out of the garden!
- Taco Stuffed Bell Peppers (Keto Stuffed Peppers) - one of my top recipes and a family favorite dinner idea!
- Green Enchiladas Chicken Soup (Keto Slow Cooker Mexican Soup) - the #1 soup on the website! 🙂
More Recipes You Will Love
⭐ Let's Connect
Chicken Fajita Casserole (Keto and Low Carb)
- 1 tablespoon olive oil
- 6 (4 to 6 ounce each) boneless skinless chicken thighs or breasts (cut into bite-sized pieces)
- 4 bell peppers (sliced (vary the colors to make it pretty!)
- 1 small onion (sliced)
- 1 recipe or package fajita seasoning mix
- 1 cup sour cream
- 4 ounces cream cheese softened
- 2 cups cheddar cheese grated
- optional for serving: avocado, guacamole, sour cream, and salsa.
- Preheat oven to 350 degrees F.
- Over medium heat, saute the chicken in olive oil until chicken is done. Remove from skillet and set aside.
- Add onions and peppers and saute until tender.
- Add chicken back to pan and stir in taco seasoning, sour cream, and cream cheese. Mix well.
- Sprinkle with cheese and bake in oven for 20 minutes or until cheese is bubbly.
© 2023 Seeking Good Eats™
Chicken Fajita Casserole (Low Carb and Keto) is a super delicious chicken casserole recipe AND an EASY Mexican recipe! One-pan from stovetop to oven. Full of your favorite fajitas flavors, but in a tasty easy casserole. Yum. This keto chicken casserole is the perfect low carb meal for the whole family. An easy keto recipe for beginners too! #chickenfajitabake #chickencasserolerecipe #mexicanrecipe #keto #lowcarb #chicken #mexicanfoodrecipes #skillet #fajitas #tacotuesday #dinner #casserole
Do you think I could go this with ground chicken?
Sure! Absolutely. Let me know how it turns out
I work a lot! Can this be made ahead of time? I like make ahead meals that my husband can just through in the oven.
Hi Sarah! Yes, it definitely can be made ahead of time! Since everything is cooked you're pretty much just re-heating until the cheese is bubbly. If you pull it straight out of the fridge cold it will take a little longer to bake and get the cheese bubbly. Enjoy!
Followed this recipe to the T, minus the bacon! Soooooo freaking good! My husband asked for thirds.
For some reason I thought the original recipe had bacon, my mistake!
How big is a serving size
Hi! Approximately 1 cup
It says 1 as the serving size but does that mean 1 cup?
Hi, it's one cup 🙂
Linda Stanfill says
Is it ok to make this with chicken breasts? Not a fan of dark meat.
Yes! Absolutely you can use chicken breasts 🙂 Enjoy!
This is sooo delicious, even as leftovers!!!! Will be making again next week!
Yay! Thanks for letting me know you loved it. We eat it A LOT too! LOL 🙂
I don’t have a cast iron skillet, do you think a stainless steel (All Clad) would work?
Any oven-proof skillet will work! 🙂
Can this be made without sour cream, or do you have an alternative? My husband doesn’t like sour cream.. I’m telling him he won’t taste it, but he won’t budge 😝
Hello! 🙂 I would just use your favorite cheese. Maybe you could add a little cream cheese? If all the cheese is making it too "thick" then you could possible add a little cream or milk to stir in?
Could you use Greek yogurt as a sub?
Sure! Since the meat is already cooked when you add the yogurt just add a little and sample first. Then you can adjust to your tastes. 🙂
This was very good!! Should be 5 stars, super simple to make and so yummy! We substituted chicken breast and put it over salad 😍
Thank you!! I love your idea of serving it over salad. That sounds so delicious 🙂
Stephanie W says
If I choose to do the copycat taco seasoning mix in this recipe. How much would I use? Do I use the whole recipe or just one serving of the recipe?
Hi! You use the whole recipe for 1 lb of meat.:-)
Natalie R says
Could this be done in a crock pot?
I think you could cook the chicken and peppers in the crockpot, but you'd want to drain the liquids before adding the rest of the ingredients. You're going to laugh...I did this very thing (only didn't drain the liquids) and that is how my Slow Cooker Chicken Fajita Soup recipe came about! LOL! 🙂
I don’t have a cast iron skillet. Do you think itll bake right in a glass 9x13 pan?
Yes, for sure! 🙂 All you're really doing is baking long enough for the cheese to get melty.
Have you tried this using steak? I love everything about this recipe but I’m not a huge fan of chicken. I assume as long as I don’t over cook the steak, I could substitute?
Yes, absolutely! Since everything is cooked prior to going in the oven you technically only have to bake this in the oven just long enough to melt the cheese and warm the casserole. I am going to make this recipe with steak this week! You have inspired me 🙂
what is the recipe for taco seasoning?
Hi! 🙂 Link is here: Copycat Taco Seasoning Recipe
So is this 8 carbs for 1 cup or 8 carbs minus 7 for fiber?? Sorry confused!
Sorry for the confusion! It's actually 7.6g net carbs. (9.4g carbs - 1.8g fiber). 🙂
Anna Smith says
This is delicious. I put a layer of refried beans in bottom of pan and then put chicken fajita mixture on top. Husband also doesn’t like sour cream but what he don’t know won’t hurt him. LOL
LOL!! That is so funny - hide the sour cream! I've hidden ingredients before too. Our secret! 🙂 I love the idea of refried beans in the bottom - sounds delicious.
Elisabeth Ensor says
I have made this 3 times already and my whole family loves it!!! I don't use as many peppers, usually just one but otherwise the same- thanks for a great recipe!
This was delicious!! I seriously wanted to lick the plate lol. I didn’t use taco seasoning and just used seasoning salt, garlic salt, and black pepper. I used 4 bell peppers of different colors but only half of each. It was seriously one of the best keto meals I’ve made. Thank you!!
Becky Morgan says
This was a great recipe and so easy. I had leftover shredded chicken from another dish and used it. I also added some grape tomatoes that I had left from a veggie tray to get them out of the fridge. I didn’t make a side and it was very liquid so I added riced cauliflower it made it more filling and I didn’t want to use tortillas. It was so yummy I’ll definitely make this again.
Shirley Knipfel says
How much of the leftover shredded chicken did you use to substitute for the 6 uncooked breasts?
Hello, about 6 cups
Shirley Knipfel says
This was a hit for my family. Made it as instructed except I cooked in skillet then transferred to baking dish. Served it with homemade lo carb tortillas, salad, salsa and sour cream! Yum!! Thanks for sharing. We will make again!
Thank you!! So glad you loved the chicken fajita bake recipe! 🙂 Great idea with the baking dish!
Would this taste ok with hamburger meat? Thanks!!! Can’t wait to try tonight.
Yes, I think it would work well! Let me know this sounds like a new recipe version 🙂
Thanks for your reply! I sure will! ❤️
Deborah D Lynch says
Absolutely delicious. I'd never made fajitas before but took a chance and made this for company tonight. I've been following keto for 6 weeks, and this was a fantastic meal.
Thank you! I"m so glad you enjoyed the recipe! 6 weeks on keto, that's so great! Stick with it you're doing great! 🙂
Simple to make and delicious
Thank you! So glad you loved it!
Phyllis Ianniccari says
You may need to correct the nutritional information. It says there are
439 Carbs with a Net Carb of 9.4.
Hi there! 🙂 It's actually correct but it reads as sodium: 439mg, carbs: 9.4g, net carb: 7.6g. I think because it's such small print and sort of all runs together it can be hard to read. Enjoy the recipe and have a good day!
This is delicious! My whole family loved it, which is significant because they are cooking aficionados. It is going into my regular dinner rotation
Thank you!! So GLAD the whole family loved it - especially the cooking aficionados. Phew! 🙂
Are you using 6 chicken breast?
That just seems like a lot for one skillet...
Use 4 to 6 oz chicken breasts. So in total around 24 to 36 ounces of chicken. I will clarify in the post. I used chicken thighs which I believe on average are around 4 ounces. It's a pretty flexible recipe so if you are over or under it's okay. Hope you enjoy! 🙂
Ok thank you!
I definitely exited to try it!!
Great! Let me know what you think and have a good weekend! -Kori
Are you using six thin sliced chicken breasts? From the video it looks to be about 3 cups of uncooked chicken in 1" pieces. Do you have the measurements in cups so that I can make this with leftover chicken?
I vary between chicken breast or thighs. They are about 4 to 6 oz each. So in total around 24 to 36 ounces of chicken. I made it with pre-cooked chicken recently and used between 5 and 6 cups. It's a pretty flexible recipe so if you are over or under it's okay. Hope you enjoy! 🙂
Do you happen to know how many calories is in a serving?
395 calories in a serving! Hope you enjoy the peppers!
Steven Smith says
It was delicious!! Made it with 3 boneless chicken breasts, 3 large red bell peppers, small onion, extra taco seasoning, hot sauce, all the cheeses, and sour cream. Did everything in a skillet and baked it in a glass 9 x 13 pan. Came out fantastic!! Definitely a keeper!! Thank you!!!
Thank you so glad you loved it!!! That sounds perfect! 🙂
I am thankful to the person who kindly shared the fact that she uses pepper flakes instead of real peppers. Unfortunately, since I have aged certain foods do Not agree with me.
Glad you found a solution for this recipe! Hope you enjoy
What size pan did you use to make this dish?
Hi, I use either a 12" skillet or (4) 6.5" individual-sized skillets. If you don't have a skillet you can transfer to a similar size casserole dish. Hope you enjoy! 🙂
When you add seasoning mix to the chicken and peppers, do you also need to add water according to the packet directions ? Or does the cream cheese and sour cream sub for the water you’d normally use ?
No need to add any additional water. The vegetables themselves have liquid in them. Give it a go as is, then next time if you want it more "saucy" you can always add a little water. I hope you enjoy! 🙂
This was delicious! My husband said this will be our new taco Tuesday meal. Love it!
Oh yay! Thank you...I'm so happy you love it!! It's one of my go-to recipes 'cause it's so easy. When it cools down I have a soup recipe you might like. It's basically the chicken fajita bake recipe just turned into a crockpot soup....Crockpot Chicken Fajita Soup. 🙂
Can I freeze this since it’s only me.
Yes, absolutely you can freeze this! 🙂 Hope you enjoyed it
This was absolutely awesome. I followed the recipe exactly. I made my family tortilla’s and they made burritos out of it. I added cilantro and avocado to mine. Definitely will be making again.
Thank you! I love your idea of turning it into a burrito! That sounds delicious!!
This is absolutely delicious! Thank you so much for sharing this recipe!
I followed it to a T and used your recipe for the seasoning as well. Hubby and I had flour tortillas with it. 5 stars!!!
Thank you so much! I'm so glad you enjoyed it! It's delicious with tortillas for sure 🙂
I cook dinner for my mother every Monday so yesterday I chose to make her this dish. She loved it! Gave it a 12 out of 10 and almost even left me a tip. Thank you for the recipe, it was really delicious.
Awwww. Best compliment EVER! Super happy you and your mother enjoyed this recipe! Thanks for trying it out. 🙂
Hayley Gilchrist says
Hi!! I’m trying to think of a veggie side that could go with this. What would you suggest?
Excited to try this for dinner this week!
Hope you enjoy! Green beans would go great! You can air fry them or even make these Mexican-style Green Beans 🙂
Amber Walker says
Can you use a rotisserie chicken?
Yes, sure! 🙂 Cook the onions and peppers until tender then add the seasoning, rotisserie chicken, and the rest of the ingredients. Enjoy!