If you’re searching for a hearty, satisfying, and low-carb dinner option, this Keto Tuna Casserole is a must-try!
This recipe is great for anyone on a ketogenic diet or wanting a healthier version of comfort food. It mixes the rich taste of tender tuna with a creamy sauce and a golden, cheesy topping.
Whether you like tuna cakes, tuna salad, or keto casseroles, this dish adds a tasty twist to your table. Packed with protein and healthy fats, it’s a family-friendly meal that’s easy to prepare and guaranteed to impress. Say goodbye to boring dinners and hello to a delicious, keto-approved favorite!
Unique Ingredients for a Flavor-Packed Keto Tuna Casserole
Canned Tuna: Opt for high-quality skipjack tuna or albacore tuna packed in water for a lean, protein-rich base.
Avocado Oil Mayonnaise: A creamy, keto-friendly mayo made with avocado oil adds richness and healthy fats.
Dijon Mustard: This smooth, tangy mustard enhances the flavor profile without overpowering the dish.
Shredded Gruyere Cheese: Known for its nutty, melt-in-your-mouth texture, Gruyere takes this casserole to the next level. (Feel free to swap in cheddar, mozzarella, or provolone if preferred.)
Finely Chopped Red Onion: Adds a subtle crunch and a touch of sweetness to balance the savory flavors.
Seasonings: A blend of sea salt, freshly ground black pepper, and a pinch of cayenne pepper for a hint of warmth without overwhelming spice.
Fresh Parsley: A sprinkle of chopped parsley adds a pop of color and a fresh, herbaceous finish. (Optional, but highly recommended!)
These carefully chosen ingredients mix to make a keto casserole. Great for a quick dinner, meal prep, or a potluck. If you like tuna cakes, tuna salad, or other keto-friendly dishes, this casserole will be a new favorite!
Step-by-Step Directions for Keto Tuna Casserole
Follow these easy steps to make a tasty and comforting Keto Tuna Casserole. Great for a quick dinner or meal prep. Let’s start!
Step 1: Preheat the Oven
Preheat your oven to 400°F (200°C). This ensures the casserole bakes evenly and develops a golden, bubbly top.
Step 2: Prepare the Ingredients
- Drain the canned tuna thoroughly and flake it into a large mixing bowl.
- Finely chop the red onion and set aside.
- Grate the Gruyere cheese (or your preferred melty cheese) and reserve a small portion for topping.
- Chop the fresh parsley for garnish, if using.
Step 3: Mix the Casserole Base
- In the mixing bowl with the tuna, add the avocado oil mayonnaise, Dijon mustard, and finely chopped red onion.
- Season with salt, black pepper, and a pinch of cayenne pepper for a subtle kick.
- Add most of the shredded Gruyere cheese, saving some for the topping. Mix everything until well combined.
Step 4: Assemble the Casserole
- Transfer the tuna mixture to a small, greased baking dish. Spread it evenly with a spatula.
- Sprinkle the reserved Gruyere cheese over the top for a gooey, golden crust.
Step 5: Bake to Perfection
- Put the baking dish in the preheated oven. Bake for 15 minutes. The casserole should feel hot, and the cheese should melt and bubble.
- For an extra golden top, broil for 1-2 minutes at the end (keep an eye on it to avoid burning).
Step 6: Garnish and Serve
- Remove the casserole from the oven and let it cool slightly.
- Garnish with freshly chopped parsley for a pop of color and freshness.
- Serve warm and enjoy your flavorful, low-carb Keto Tuna Casserole!
Tips for Achieving Maximum Flavor
To elevate your Keto Tuna Casserole to the next level, focus on quality ingredients and thoughtful preparation. Start by using high-quality canned tuna packed in water or olive oil for a fresher taste. Opt for avocado oil mayonnaise and Dijon mustard to add richness and depth without overpowering the dish.
Don’t hold back on seasoning. Add a pinch of cayenne pepper for a little kick. Use a good amount of sea salt and black pepper to balance the flavors. Choose a flavorful variety of cheese, like Gruyere or sharp cheddar, and ensure you grate it fresh for better melting.
Finally, bake until the top is golden and bubbly, and garnish with fresh parsley for a bright, herbaceous finish. These small touches will ensure your casserole is bursting with flavor in every bite!
Frequently Asked Questions
Can I make this recipe ahead of time?
Absolutely! You can prepare the tuna mixture in advance and store it in the fridge for up to 24 hours. When ready to bake, simply add the cheese topping and pop it in the oven.
Is this recipe freezer-friendly?
Yes, this casserole freezes well. Assemble the dish (without baking), cover it tightly, and freeze for up to 2 months. Thaw in the fridge overnight before baking as directed.
Can I use a different type of cheese?
Definitely! Gruyere gives a rich, nutty flavor. You can replace it with cheddar, mozzarella, or dairy-free cheese. These options will provide a similar melty texture.
How can I make this dish spicier?
For a spicier kick, increase the amount of cayenne pepper or add a dash of hot sauce to the tuna mixture before baking.
What sides pair well with this casserole?
This casserole pairs beautifully with a crisp green salad, steamed vegetables, or cauliflower rice for a complete low-carb meal.
keto tuna casserole
Ingredients
- 2 5- ounce cans tuna in water - drained and flaked
- ⅓ cup mayonnaise
- 1 tablespoon Dijon mustard
- ½ cup Gruyere cheese - shredded divided
- ¼ cup red onion - minced
- ¼ teaspoon sea salt
- ¼ teaspoon black pepper
- ¼ teaspoon cayenne pepper
- ¼ cup parsley - chopped for garnish
Instructions
Step 1: Preheat the Oven
- Preheat your oven to 400°F (200°C). This ensures the casserole bakes evenly and develops a golden, bubbly top.
Step 2: Prepare the Ingredients
- Drain the canned tuna thoroughly and flake it into a large mixing bowl.
- Finely chop the red onion and set aside.
- Grate the Gruyere cheese (or your preferred melty cheese) and reserve a small portion for topping.
- Chop the fresh parsley for garnish, if using.
Step 3: Mix the Casserole Base
- In the mixing bowl with the tuna, add the avocado oil mayonnaise, Dijon mustard, and finely chopped red onion.
- Season with salt, black pepper, and a pinch of cayenne pepper for a subtle kick.
- Add most of the shredded Gruyere cheese, saving some for the topping. Mix everything until well combined.
Step 4: Assemble the Casserole
- Transfer the tuna mixture to a small, greased baking dish. Spread it evenly with a spatula.
- Sprinkle the reserved Gruyere cheese over the top for a gooey, golden crust.
Step 5: Bake to Perfection
- Put the baking dish in the preheated oven. Bake for 15 minutes. The casserole should feel hot, and the cheese should melt and bubble.
- For an extra golden top, broil for 1-2 minutes at the end (keep an eye on it to avoid burning).
Step 6: Garnish and Serve
- Remove the casserole from the oven and let it cool slightly.
- Garnish with freshly chopped parsley for a pop of color and freshness.
- Serve warm and enjoy your flavorful, low-carb Keto Tuna Casserole!