This easy and cheesy Chicken Fajita Casserole is a super delicious and EASY Mexican-inspired recipe! It's loaded with all your favorite classic fajita ingredients - but it's a tasty casserole. Only 8 ingredients and one pan from stovetop to oven! Seriously, your family will love it. Bonus: it's gluten free, low carb, keto-friendly, and has no added sugar!
You'll Love This Keto Chicken Fajita Casserole Recipe!
"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.
It's easy! This casserole is the 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.
It's low carb! This casserole is gluten free, low carb, keto-friendly, and has no added sugar. The fat can be lowered by using chicken breasts instead of thighs, lowering the amount of cheese used and by substituting a lower fat sour cream.
Fajita Casserole Ingredients
Here are the ingredients you will need to make this easy chicken fajita casserole:
- Olive Oil
- Chicken Thighs - boneless skinless thighs, but you can also use chicken breast too!
- Bell Peppers - use any favorite color. I love using different colors.
- Yellow 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 fajita seasoning mix or taco seasoning. I highly recommend you make your own seasoning mix - it's easy, inexpensive, and much healthier than store-bought.
- Sour Cream
- Cream Cheese
- 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!
Be sure to pin this pin to Pinterest for later! 😉
How To Make Chicken Fajita Casserole
You will be pleasantly surprised at how easy this casserole is to make! Here is an overview, for complete details, please see the printable recipe card below. Enjoy!
- Cook chicken: In an ovenproof skillet saute chicken until done. Remove from pan and keep warm
- Cook veg: Saute onions and bell peppers until tender.
- Mix it all together: Add chicken back to the pan. Stir in cheddar cheese, sour cream, and seasoning.
- Sprinkle and bake: Sprinkle the top with the shredded cheddar cheese and bake in the oven until cheese is melted.
How Do You Cut Chicken Breast for Chicken Fajitas?
For traditional fajitas, cut chicken breast into thin ½" 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.
How to Serve 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, salsa, Chipotle Crema, or Roasted Chili Corn Salsa for added freshness.
What toppings go on chicken fajitas?
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!
How To Store Fajita Chicken Casserole
Store any leftover fajita casserole in an airtight container up to 3 days. This recipe does not freeze well as the peppers become very watery and the dairy often separates.
Keto Chicken Fajitas Casserole Tips
- Use boneless chicken thighs or breasts that have been cut into uniform sizes (approx 1" to 2" in size, or you can do 1½" 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.
Fajita Chicken Casserole FAQs
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.
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
Fajitas without tortillas and contains approximately 10 grams of carbs per 1 cup serving.
If you tried this recipe, let me know! I'd love for you to come back and give the recipe a 5 star rating and leave a review in the comments! 🙂 Let's stay connected, so please follow me on Instagram, Facebook, and Pinterest! Subscribe to my newsletter to get healthy fresh recipe ideas every week!
Chicken Fajitas Casserole (easy and cheesy!)
Ingredients
- 1 tablespoon olive oil
- 6 (4 to 6 ounces 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 (taco seasoning may also be used)
- 1 cup sour cream
- 4 ounces cream cheese softened
- 2 cups cheddar cheese grated
- optional for serving: avocado, guacamole, sour cream, and salsa.
Instructions
- 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 desired tenderness is reached.
- 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 10 to 15 minutes or until cheese is melted.
Video
Kori's Tips
Nutrition
© 2024 Seeking Good Eats™
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!
- Homemade Salsa Verde Recipe
- 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! 🙂
Julie
Great recipe! The only thing I did differently was used just a frying pan and combined everything in it. It was a big hit, thank you so much.
seekinggoodeats
Great! So glad you loved the casserole. Thanks for giving it a try! 🙂
Samantha
This is SO good. One of my favorite dishes and super simple to make!! I don’t and my family don’t need low carb, so I just added some cooked brown rice as a base in the dish before putting in the oven. 10/10 recommend and I even topped with a little bit of salsa. Yum!!
seekinggoodeats
Thank you!!! This has been one of my go-to recipes for years as since so darn easy! 🙂
Amber Walker
Can you use a rotisserie chicken?
seekinggoodeats
Yes, sure! 🙂 Cook the onions and peppers until tender then add the seasoning, rotisserie chicken, and the rest of the ingredients. Enjoy!
Hayley Gilchrist
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!
Kori
Hope you enjoy! Green beans would go great! You can air fry them or even make these Mexican-style Green Beans 🙂
T.M.F.
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.
Kori
Awwww. Best compliment EVER! Super happy you and your mother enjoyed this recipe! Thanks for trying it out. 🙂
Garit
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!!!
Kori
Thank you so much! I'm so glad you enjoyed it! It's delicious with tortillas for sure 🙂
Debbie
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.
Kori
Thank you! I love your idea of turning it into a burrito! That sounds delicious!!
Cathy
Can I freeze this since it’s only me.
Kori
Yes, absolutely you can freeze this! 🙂 Hope you enjoyed it
Cory
This was delicious! My husband said this will be our new taco Tuesday meal. Love it!
Kori
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. 🙂
Carol
What size pan did you use to make this dish?
Kori
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! 🙂
Taylor
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 ?
Kori
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! 🙂
Mary
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.
Kori
Glad you found a solution for this recipe! Hope you enjoy
Steven Smith
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!!!
Kori
Thank you so glad you loved it!!! That sounds perfect! 🙂
Cindy
Do you happen to know how many calories is in a serving?
Kori
395 calories in a serving! Hope you enjoy the peppers!
Stephanie
Are you using 6 chicken breast?
That just seems like a lot for one skillet...
Kori
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! 🙂
Stephanie
Ok thank you!
I definitely exited to try it!!
Kori
Great! Let me know what you think and have a good weekend! -Kori
Tess
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?
Kori
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! 🙂
Aleta
This is delicious! My whole family loved it, which is significant because they are cooking aficionados. It is going into my regular dinner rotation
Kori
Thank you!! So GLAD the whole family loved it - especially the cooking aficionados. Phew! 🙂
Phyllis Ianniccari
You may need to correct the nutritional information. It says there are
439 Carbs with a Net Carb of 9.4.
seekinggoodeats
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!
Suzanne
Simple to make and delicious
seekinggoodeats
Thank you! So glad you loved it!
Deborah D Lynch
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.
seekinggoodeats
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! 🙂
Jen
Would this taste ok with hamburger meat? Thanks!!! Can’t wait to try tonight.
seekinggoodeats
Yes, I think it would work well! Let me know this sounds like a new recipe version 🙂
Jen
Thanks for your reply! I sure will! ❤️
Carol
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!
seekinggoodeats
Thank you!! So glad you loved the chicken fajita bake recipe! 🙂 Great idea with the baking dish!