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45-Minute Low Carb Keto Tuna Casserole with Spinach – Irresistible!

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A creamy and cheesy low carb keto tuna casserole with spinach, perfect for a satisfying dinner.

Ingredients

Scale
  • 2 (5 oz) cans tuna in water, drained well
  • 10 oz frozen chopped spinach, thawed and squeezed dry (or 5–6 oz fresh spinach, wilted)
  • 2 tbsp butter
  • 1/2 cup onion, finely diced
  • 3 cloves garlic, minced
  • 1/2 cup chicken broth
  • 1 cup heavy cream
  • 4 oz cream cheese, softened
  • 1 1/4 cups shredded mozzarella, divided
  • 1/2 cup grated Parmesan, divided
  • 1 tsp Dijon mustard (optional)
  • 1 tsp Italian seasoning
  • 1/2 tsp salt (adjust to taste)
  • 1/2 tsp black pepper
  • 1/4 tsp paprika (optional)
  • Low-Carb ‘Noodle’ Layer (pick one)
  • 1 jar/can hearts of palm lasagna sheets, rinsed and patted dry OR
  • 3 medium zucchini, sliced into thin ribbons (patted dry)
  • 1/2 cup crushed pork rinds (fine crumbs)
  • 2 tbsp melted butter
  • 2 tbsp grated Parmesan

Instructions

  1. Preheat oven to 375°F. Grease an 8×8-inch baking dish.
  2. Melt butter in a skillet over medium heat. Cook onion for 3–4 minutes until soft. Add garlic and cook for 30 seconds.
  3. Stir in chicken broth, heavy cream, cream cheese, Dijon (if using), Italian seasoning, salt, pepper, and paprika. Simmer for 3–5 minutes until smooth and slightly thickened.
  4. Fold in tuna and squeezed-dry spinach. Stir in 3/4 cup mozzarella and 1/4 cup Parmesan until melted.
  5. Spread a thin layer of sauce in the baking dish. Add a layer of hearts of palm sheets or zucchini ribbons.
  6. Add more tuna-spinach sauce. Repeat layers, finishing with sauce on top.
  7. Sprinkle with remaining 1/2 cup mozzarella. Mix pork rind crumbs, melted butter, and 2 tbsp Parmesan, then sprinkle over the top.
  8. Bake for 20–25 minutes until bubbling. Broil for 1–2 minutes to get the top golden.
  9. Let stand for 10 minutes before slicing and serving.

Notes

  • Adjust salt to taste.
  • Watch closely while broiling to avoid burning.
  • Use fresh spinach if preferred.

Nutrition

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