This Keto Tuna Casserole brings together the comforting flavors of a classic dish with a low-carb twist that keeps it healthy and satisfying. The creamy, cheesy filling pairs wonderfully with tender cauliflower rice and savory tuna, making it a perfect option for an effortless weeknight dinner.
Every bite offers a nostalgic taste with a modern ketogenic makeover, ensuring you don’t miss out on indulgence while staying on track with your dietary goals. It’s a family-friendly meal that’s simple to prepare yet full of rich, delicious flavors.
- Low-carb and keto-friendly while maintaining classic casserole comfort.
- Creamy, cheesy texture balanced with the freshness of cauliflower rice.
- Quick and easy to make, great for busy weeknights.
- Uses simple pantry staples you likely already have on hand.
Ingredients
- Tuna (2 cans, 5 oz each, drained): Provides high-quality protein and a savory, flaky texture for the casserole base.
- Cauliflower rice (1 cup, fresh or frozen): A low-carb substitute for traditional rice that adds bulk and nutrition.
- Heavy cream (1 cup): Adds richness and creaminess, helping to bind the casserole components.
- Shredded cheddar cheese (1 cup): Brings sharp, melty flavor and a golden crust when baked.
- Frozen peas (1/2 cup, optional): Adds slight sweetness and pop of color to brighten the dish.
- Diced onion (1/4 cup): Provides aromatic depth and mild sweetness after sautéing.
- Minced garlic (2 cloves): Infuses warmth and savory notes enhancing the overall flavor.
- Salt and pepper: Essential seasonings to taste, enhancing all ingredients’ natural flavors.
- Olive oil: Used for sautéing onion and garlic, adding a subtle fruity richness.
Instructions
- Preheat the oven
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Set your oven to 350°F (175°C) to ensure it reaches the perfect temperature by the time your casserole is assembled. This moderate heat cooks the casserole evenly without burning the cheese.
- Sauté the aromatics
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Heat olive oil in a skillet over medium heat. Add diced onion and minced garlic, cooking until softened and fragrant, about 3-4 minutes. This step develops the base flavor and mellows the sharpness of raw onion and garlic.
- Combine tuna mixture
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In a large mixing bowl, stir together the drained tuna, cauliflower rice, heavy cream, frozen peas (if using), and sautéed onions and garlic. Season with salt and pepper to taste, then fold in half of the shredded cheddar cheese to incorporate cheesy creaminess throughout the filling.
- Assemble the casserole
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Grease a 9×9-inch baking dish to prevent sticking. Pour the tuna mixture evenly into the dish, smoothing the top. Sprinkle the remaining cheddar cheese evenly over the surface to create a luscious melty topping.
- Bake to perfection
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Bake the casserole in the preheated oven for 25-30 minutes, or until the cheese is fully melted, bubbly, and golden brown. Allow the casserole to cool slightly before serving to let it set for easier slicing and richer flavor melding.
- Use fresh or frozen cauliflower rice depending on availability and preference; both work equally well.
- Omitting peas keeps the dish fully keto, but peas add vibrant color and mild sweetness if desired.
- Adjust seasoning carefully after baking if needed, as cheese and cream add saltiness.
Storage Tips
Store leftovers covered tightly in the refrigerator for up to 3 days. Reheat gently in the oven or microwave to maintain creamy texture and flavor integrity.
Serving Suggestions
This casserole pairs beautifully with a crisp green salad or steamed low-carb vegetables like broccoli or asparagus for a balanced meal. Garnish with fresh herbs like parsley or chives to add freshness and color.
- For an even richer flavor, try mixing in a spoonful of cream cheese with the heavy cream before combining.
- Use sharp cheddar for a more pronounced cheesy flavor, or mix cheddar with mozzarella for extra stretchiness.
- To add crunch, sprinkle a handful of crushed pork rinds or almond flour breadcrumbs on top before baking.
FAQs
- Can I use canned salmon instead of tuna?
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Yes, canned salmon is a great substitution and will add a slightly different but delicious flavor profile.
- Is this recipe suitable for a strict keto diet?
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Yes, especially if you omit peas or use them sparingly, as peas contain some carbs but are still keto-friendly in moderation.
- Can I prepare this casserole ahead of time?
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Absolutely, you can assemble it ahead and refrigerate the dish before baking, adding a few extra minutes to the baking time.
- What’s the best cauliflower rice to use?
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Fresh cauliflower rice offers the best texture, but frozen is convenient and works well if thawed and drained properly.
- Can I freeze leftovers?
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Yes, freeze in an airtight container for up to 1 month. Thaw overnight in the fridge before reheating.
- How do I make this recipe dairy-free?
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You can substitute heavy cream with coconut cream and use dairy-free cheese alternatives, though the flavor and texture will vary.
- Can I add other vegetables?
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Definitely! Low-carb vegetables like spinach, mushrooms, or bell peppers can be sautéed and added to the casserole.
Keto Tuna Casserole
Equipment
- 1 skillet
- 1 9x9-inch baking dish
Ingredients
- 2 cans 5 oz each tuna, drained
- 1 cup cauliflower rice fresh or frozen
- 1 cup heavy cream
- 1 cup shredded cheddar cheese divided
- 1/2 cup frozen peas optional
- 1/4 cup diced onion
- 2 cloves garlic minced
- Salt and pepper to taste
- Olive oil for cooking
Instructions
- Preheat oven to 350°F (175°C).
- Heat olive oil in a skillet over medium heat, then sauté diced onion and minced garlic until softened.
- In a mixing bowl, combine drained tuna, cauliflower rice, heavy cream, frozen peas if using, salt, and pepper.
- Stir in half of the shredded cheddar cheese into the mixture.
- Pour the mixture into a greased 9x9-inch baking dish, then top with the remaining cheddar cheese.
- Bake for 25-30 minutes until cheese is melted and bubbly.
- Let the casserole cool slightly before serving.
Notes
- For extra flavor, add some paprika or cayenne pepper.
- Substitute cheddar with mozzarella or a cheese blend if preferred.
- Store leftovers in the fridge for up to 3 days.
