You can easily make a cheesy keto tuna casserole for a delicious dinner with ingredients you probably have on hand. Even kids love this easy low carb tuna bake with spinach. It's kid-approved dish with a tasty serving of veggies!
I am all about easy dinners I can throw together with ingredients I already have in my kitchen.
In fact, this tuna spinach casserole came about because I was trying to use up food before it went bad. I had canned tuna close to its expiration date and some fresh grated parmesan that I didn’t want to get moldy.
These seemed like a great starting point for an easy casserole.
I checked my freezer, found a bag of frozen spinach, and thought that would be a good way to add some veggies. So I threw together a few more ingredients and stuck it in the oven.
Based on the ingredients, I assumed this low carb tuna casserole would be tasty. But I was pleasantly surprised at just how delicious it turned out! Even my youngest daughter devoured it.
When a dish includes veggies and fish, and the kids STILL scarf it down, I know I have a great recipe on my hands.
How to make keto tuna casserole
This casserole starts on the stove-top, then finishes in the oven. It’s very easy to prep and only requires one saucepan and one casserole dish!
Preparing the main ingredients
- In a medium saucepan on low heat, saute garlic in butter until golden.
- Add cream and almond milk and cook for about 5 minutes, stirring frequently.
- Whisk in the parmesan cheese.
- Add the dried parsley, canned tuna, and drained frozen spinach.
- Cook over medium-high heat, stirring frequently, until mixture is bubbly.
Prepping and baking the casserole
- Add the hot mixture to a lightly-greased casserole dish.
- Top with slices of cheese.
- Bake at 375°F for 20-30 minutes, until cheese is nice and bubbly.
The casserole will still be a bit runny after baking. This is totally normal.
As long as the cheese is melted and the flavors have come together, it’s ready to enjoy. The result is a delicious, cheesy, messy casserole the whole family will devour!
For this dish, I wanted to keep it simple while still adding some great flavor. I chose to include sautéed garlic, a bit of dried parsley, and plenty of bubbly cheese.
The flavor turned out even better than I expected!
However, there’s plenty of wiggle room to make this recipe your own. After all, it was created to use up ingredients before they went to waste.
A few ways you can switch up this dish to make it your own:
- Substitute canned tuna: If you don’t have canned tuna but have canned salmon or even canned chicken, those will work just as well!
- Substitute cheeses: Any cheese will be delicious in low carb tuna casserole. Feel free to use what you have.
- Thicker sauce: Thanks to the almond milk, the sauce of this casserole turns out nice and light. It will be a bit runny on your plate. If you prefer a thicker sauce, use a blend of heavy cream and cream cheese instead.
Have you tried any variations of this dish? Let us know in the comments below!
Is tuna good for low carb diet
With zero carbs per serving, tuna is a perfect ingredient for keto and low carb diets.
It is also an excellent source of protein, nutrients, and omega-3 fatty acids.
Tuna is naturally very low in fat, so many low carb tuna recipes use high-fat ingredients to balance the macros. There is so much you can do with tuna to create a delicious meal or snack.
Personally, I love canned tuna because it’s budget-friendly and lasts a long time. It’s perfect for situations exactly like the one that led to this recipe!
When you just need to throw together a quick dinner, having canned tuna on hand gives you so many low carb and keto friendly options.
Are shirataki noodles keto?
Shirataki noodles have become a popular ingredient in keto and low carb recipes lately.
They are 97% water and 3% glucomannan, a non-digestible fiber. They also digest very slowly, which helps you feel full for longer.
The result is a carb free, extremely low-calorie food that keeps you satisfied! This is why they’re a popular ingredient to add bulk to dishes like casseroles.
However, some people do not like the taste or the texture.
There are a few different ways to cook shirataki noodles to make them more like traditional pasta noodles. Even still, they just aren’t for everyone.
This easy keto tuna casserole does not use shirataki noodles. So if you are not a fan, don’t worry! I find that the spinach adds plenty of bulk and texture, so I don’t miss noodles.
On the other hand, if you’re looking for a more traditional tuna noodle casserole, check out this recipe that uses shirataki noodles!
Are peas keto?
Traditional tuna casseroles usually include peas as one of the ingredients.
However, peas are not keto friendly. 1 cup of peas contains 14 net carbs and 8 grams of sugar, so they are not considered a low carb ingredient.
I still wanted to include a vegetable, which is why I included spinach. It’s a much better option to keep carbs low, and it’s delicious in this recipe! I didn’t miss the peas at all.
Other low carb fish-based recipes
Looking for a few other delicious recipes that use healthy fish like tuna and salmon? Check out a few of these favorites:
- Keto Salmon Patties use canned fish and pork rinds. Fry them up in a pan for an easy, super tasty dinner option!
- Incredible Low Carb Tuna Pie is made with cheese, green beans, and low carb flour for a creamy and filling dish.
- Salmon Loaf with Dill Sauce is a delicious twist on traditional meatloaf with an absolutely amazing sauce on top!
- Tuna Egg Salad with sour cream is perfect for low carb sandwiches or wraps and comes together in 5 minutes or less.
- Smoked Salmon Pate with cream cheese is a satisfying snack or appetizer to serve with cucumber slices or low carb crackers.
- Low Carb Fish Curry from Ditch The Carbs is a flavorful dish with a blend of fish, coconut, and spinach.
Cheesy Low Carb Keto Tuna Spinach Casserole
- ¼ cup butter
- 1 clove garlic minced
- 1 cup heavy cream
- ½ cup unsweetened almond milk
- 1 ½ cups Parmesan cheese
- 1 Tablespoon dried parsley
- 10 ounces canned tuna
- 9 ounces frozen spinach drained
- 4 slices provolone or mozzarella cheese
- Melt butter in medium saucepan over medium low heat with garlic.
- When garlic is golden, add cream and almond milk.
- Stir over heat for 5 minutes then whisk in parmesan cheese.
- Stir in parsley, tuna and spinach.
- Cook over medium-high heat until bubbly, stirring frequently.
- Spoon into lightly greased or sprayed casserole dish.
- Top with sliced cheese, if desired.
- Bake at 375F for 20 to 30 minutes or until bubbly.
Notes on Nutritional Information
Nutritional information for the recipe is provided as a courtesy and is approximate only. We cannot guarantee the accuracy of the nutritional information given for any recipe on this site. Erythritol carbs are not included in carb counts as it has been shown not to impact blood sugar. Net carbs are the total carbs minus fiber.
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Originally published: September 18, 2011... Last Updated: January 9, 2020