This easy keto tuna casserole is a great choice for anyone looking for a tasty, low-carb meal. It’s perfect for those on a keto diet or anyone who wants to cut down on carbs.
The recipe is simple to make and uses ingredients you probably already have in your kitchen. The main star of this dish is tuna, which is packed with protein and healthy omega-3 fats.
We mix it with cheese, mayo, and some flavorful seasonings to create a creamy and satisfying casserole. The best part? It only takes about 20 minutes to prepare and cook.
You can easily change up the flavors by using different types of cheese or adding in some of your favorite low-carb veggies. It’s also a great meal to make ahead of time and reheat for quick lunches or dinners throughout the week.
Whether you’re new to keto cooking or you’ve been doing it for a while, this keto tuna casserole is sure to become a favorite in your meal rotation. Let’s get started!
👍 Why You’ll Love This Recipe
Quick Prep Time: You just mix the ingredients and pop it in the oven. It’s perfect for those busy weeknights when you don’t have a lot of time but still want a tasty, keto-friendly meal. You can even prepare it ahead of time and just bake it when you’re ready to eat.
High in Protein: Tuna is packed with protein, which is essential for a keto diet. Each serving of this casserole gives you a good dose of protein to help keep you full and satisfied.
Budget-Friendly: Canned tuna is an affordable protein source, making this recipe easy on your wallet. You don’t need to spend a lot to eat well on keto.
Comfort Food : This casserole gives you that warm, comforting feeling of a home-cooked meal, but without the carbs. It’s creamy, cheesy, and satisfying – everything you want in comfort food.
✨ Recipe Ingredients
- 2x 5oz cans Tuna in Water (drained) -I recommend this tuna – Amazon
- 1/2 cup Gruyere Cheese (shredded & divided)
- 1/3 cup Mayo
- 1/4 cup Red Onion (minced)
- 1 tablespoon Dijon Mustard – I recommend this one – Amazon
- 1/4 teaspoon Salt
- 1/4 teaspoon Cayenne Pepper
- Black Pepper (to taste)
- 1/4 cup Parsley (for garnishing)
👨🍳 How To Make
Follow this easy recipe:
Step 1
Start by preheating the oven to 400°F (200°C).
Step 2
In a bowl, mix the mayonnaise, tuna, mustard, 1/4 cup of cheese, salt, pepper, onion, and cayenne.
Step 3
Transfer the mixture to a small 1-quart casserole dish and sprinkle the remaining cheese on top.
Step 4
Bake in the oven for 12-15 minutes until hot.
Step 5
Remove from the oven, garnish with parsley, and return to the oven for 1-2 more minutes.
Remove from the oven and serve. Enjoy!
💡Tips
1. Mix It Up Good
When you’re combining all the ingredients, really take the time to mix everything well. You want every bite of the casserole to have a good balance of tuna, cheese, and seasoning. Use a big bowl to give yourself plenty of room to work.
A rubber spatula or wooden spoon works great for this. Make sure you break up any big chunks of tuna as you mix. Keep going until everything looks evenly distributed.
2. Shred Your Own Cheese
I know it’s tempting to use pre-shredded cheese – it’s convenient, right? But here’s the thing: pre-shredded cheese often has added starches to keep it from clumping. These can add unnecessary carbs to your keto dish.
Plus, freshly shredded cheese melts way better. Get yourself a block of Gruyere and grate it yourself. It only takes a few extra minutes and the result is so worth it.
3. Let It Rest Before Serving
I know it’s tempting to dig in right away, but giving your casserole a few minutes to rest after it comes out of the oven makes a big difference.
This allows the cheese to set a bit, making it easier to serve. It also lets the flavors meld together even more. About 5 minutes should do the trick. Use this time to prep any side dishes or set the table.
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FAQ
1. Can I use canned tuna in oil instead of water?
Yes, you can use tuna in oil. However, make sure to drain it well. Tuna in oil might add a bit more fat to your dish, which is good for keto.
But it could also make your casserole a bit greasier. If you use tuna in oil, you might want to reduce the mayo slightly to balance it out.
2. What can I use instead of Gruyere cheese?
If you can’t find Gruyere or want to try something different, there are several options. Cheddar cheese works great and gives a nice sharp flavor. Swiss cheese is another good choice that melts well. Mozzarella can work too, though it’s milder in flavor.
3. Can I add vegetables to this casserole?
Absolutely! Adding veggies is a great way to boost nutrition and add more flavor. Just make sure to choose low-carb vegetables to keep it keto-friendly.
Spinach, zucchini, bell peppers, or broccoli work well. Chop them small and sauté them before adding to the mix.
Keto Tuna Casserole
- Start by preheating the oven to 400°F (200°C).
- In a bowl, mix the mayonnaise, tuna, mustard, 1/4 cup of cheese, salt, pepper, onion, and cayenne.
- Transfer the mixture to a small 1-quart casserole dish and sprinkle the remaining cheese on top.
- Bake in the oven for 12-15 minutes until hot.
- Remove from the oven, garnish with parsley, and return to the oven for 1-2 more minutes. Remove from the oven and serve. Enjoy!