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–+ servings
Baked low carb tuna casserole in a white casserole dish.

Low Carb Keto Tuna Casserole Recipe

A very simple and tasty low carb and keto tuna casserole recipe! The zucchini, cauliflower, and herbs pair well with the melted cheese and tuna. Substitute salmon, shrimp, or crab for the tuna too!
4.74 from 15 votes
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Author Kori Butler
Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Course Casserole Recipes
Cuisine American
Servings 6 servings
Calories 332 kcal

Ingredients
  

  • 3 cups cooked cauliflower (florets about 1" to 1½" in size)
  • 2 (6.5-ounce) cans drained tuna (or, salmon, crab, or shrimp)
  • ½ cup chopped celery
  • ½ cup sliced green onions
  • ½ cup mayonnaise
  • ½ cup sour cream
  • 2 teaspoons dijon mustard
  • 1 tablespoon fresh dill (or, 1 teaspoon dried)
  • ½ teaspoon kosher salt
  • ¼ teaspoon pepper
  • 1 small zucchini (very thinly sliced)
  • 1½ cups shredded cheddar or jack cheese (or, mozzarella, swiss, gouda)
  • ¼ cup crushed pork rinds

Instructions
 

  • Preheat oven to 350 degrees. Prep and assemble your ingredients. Drain tuna (or other seafood), and set aside.
  • In a bowl, combine cauliflower, tuna, celery, green onions, mayonnaise, sour cream, mustard, dill, salt, and pepper.
  • In a buttered 1½-quart casserole dish, spoon half of the tuna mixture. Layer half the zucchini and half the cheese. Top with the remaining half of the tuna mixture and zucchini. Finish with cheese.
  • Sprinkle crushed pork rinds over the top. Bake at 350 degrees for 40 minutes until the dish is hot and cheese is bubbly.
  • Sprinkle with fresh dill and serve.

Video

Kori's Tips

  • Don't miss all of our helpful hints, substitution ideas, cooking tips, and other delicious recipes that can be found in our post. Check it out!
  • VARIATIONS: Substitute canned shrimp or salmon; use chives, parsley, or thyme in place of dill - or a mix; mozzarella, jack, or cheddar cheese can be used; green onion can be added to the casserole.
  • TIPS: Roasted (oven or air fryer), boiled, or steamed cauliflower will all work great. The best flavor is roasted cauliflower. Reduce the amount of salt called for when roasting.
  • SERVING SUGGESTIONS: Adjust salt and pepper. Garnish with fresh dill or chives and diced tomato.

 

 
 

Nutrition

Calories: 332kcalCarbohydrates: 4.8gProtein: 20.8gFat: 25.5gCholesterol: 49.7mgSodium: 721mgFiber: 1.4gSugar: 2.6g
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