This keto tuna casserole is the ultimate low-carb dinner option packed with creamy sauce, cheese, and tuna. There are no noodles in this casserole, but trust me, you won’t even miss them since it is loaded with flavor. Besides, it is insanely easy to make and will take you just half an hour.
If you’re looking for a lazy recipe for a delicious keto-friendly dinner, then you’ve found it. With just 2.3 net carbs per serving, this cheese tuna casserole will soon become your all-time favorite dinner option.
Remember, it takes just 30 minutes to make this cheese tuna casserole. This makes it a perfect low-carb dinner option for those days when you are pressed for time and are craving something filling and comforting for dinner.
Here’s What You’ll Need
For this keto tuna casserole, you’ll need less than 10 simple ingredients.
- Tuna. I used canned tuna in water. Before adding the tuna into the casserole, you should drain the water from it. Also, be careful when choosing the tuna and look for only high-quality and MSC-labeled tuna fish.
- Bell pepper. Have you ever tried bell peppers and tuna together? It is really tasty. Therefore, I chose to add chopped bell peppers into this low-carb tuna casserole too.
- Onion. You’ll need just one small onion. Simply chop it up and add it into the casserole.
- Mayonnaise. When it comes to choosing mayo for my recipes, I usually always go with the avocado oil kind. Sir Kensington’s Mayonnaise is my favorite choice, but you can choose any other avocado oil mayonnaise that you prefer.
- Mozzarella. Choose any kind of shredded mozzarella.
- Cottage cheese. It may seem weird to add this ingredient to the tuna casserole. But actually, it is the key ingredient here. If you have a hard time finding cottage cheese in your store or simply don’t like it, you can use ricotta instead.
- Red pepper flakes. I like to add some heat to this keto casserole, which is why I throw in some red pepper flakes. But, of course, they are optional here.
- Garlic salt. I love garlic salt since it gives that amazing aroma to any meal. If you don’t have it, you can substitute it with some granulated garlic and salt.
Also, there are some optional ingredients that you can add depending on your preferences. But if you decide to add something extra into the tuna casserole, remember that the meal's nutritional value will also change.
Here’s what else you can add to this low-carb casserole:
- Zucchini noodles
- Heavy cream
- Cheddar cheese
- Parmesan cheese
- Lemon juice
Here are some tips that can help you make an ultra-tasty keto tuna casserole:
- Use a suitable baking pan. For this recipe, I used a 5x9-inch baking pan. If you don’t have such a pan, you can use a slightly smaller one. Also, make sure that it is a non-stick one.
- Add crushed pork rinds on top. If you want the casserole to have a crunchy top, you can add some crushed pork rinds. It is a perfect option since it won’t add too much unnecessary carbs and will deliver an amazing crunchy texture.
- Add some heavy cream. If you are worried that the casserole may turn out dry, you can add some heavy cream. But as I’ve noticed, the casserole usually turns out pretty moist, so adding the heavy cream may be unnecessary.
I recommend serving this keto tuna casserole with a simple side salad. Just mix some lettuce, a chopped cucumber, avocado, cherry tomatoes, chives, and add your favorite low-carb salad dressing.
Some keto fried cauliflower rice on the side will also be a perfect option to go with this tuna casserole. Or, if you wish to boost your veggie intake, you can throw in some of the Air Fryer garlic Brussels sprouts.
How to Store It
It is best to store the keto tuna casserole leftovers in the fridge in an airtight container. It can be stored in such a way for up to 3 days. This casserole tastes best when warm, so you’ll need to reheat it before serving. To prevent your casserole from becoming dry after reheating, you can add some heavy cream on top of the casserole slice.
Also, you can make the casserole beforehand and freeze it. Just mix all of the needed ingredients, place everything in a baking pan, and then put it in the freezer. Whenever you wish to serve it, place the baking pan with the casserole in the oven and cook for 35 minutes.
One Pot Keto Tuna Casserole
- 2 5-oz cans of tuna in water drained
- 3 oz bell pepper chopped
- 1 small onion chopped
- 3 tbsp avocado oil mayonnaise
- 3 oz mozzarella shredded
- 3 oz cottage cheese or ricotta
- ¼ tsp red pepper flakes optional
- ¼ tsp garlic salt
- Preheat the oven to 350 F. Prepare a 5x9-inch baking pan and spray it with some cooking oil.
- In a bowl, mix together all of the ingredients: drained tuna, chopped bell pepper, chopped onion, mayonnaise, shredded mozzarella, cottage cheese, pepper flakes, and garlic salt.
- Bake for 20-25 minutes or until the cheese has melted and the top of the casserole turned golden brown.