There’s something about coming home after a long day, the kind where your mind’s been somewhere else entirely, and finding a casserole bubbling in the oven. This low carb cheesy tuna casserole has been my go-to comfort when I want something hearty without the carb overload. The kitchen fills with the scent of melted cheddar and garlic, a quiet invitation to slow down for a moment. I admit, I sometimes get a little distracted checking my phone while it bakes—maybe it’s that impatient hunger talking—but the wait is worth it. Each bite is creamy and rich, with little pops of tender broccoli and cauliflower that keep it feeling fresh, not heavy. It’s like a warm hug that’s both familiar and a tiny bit unexpected.
- Quick to prepare, which is a lifesaver on those chaotic evenings.
- Balances creamy cheese with fresh low carb veggies, so it doesn’t feel like a compromise.
- It’s simple—and that’s kind of the point. No complicated steps or fancy ingredients.
- Feeds a small family or leaves you with leftovers that reheat surprisingly well, though I usually prefer it fresh.
If you’re a bit hesitant about mixing tuna into a casserole, I felt the same way at first. But the flavors blend smoothly, and the cheese really brings everything together. Just remember, the texture is best the day you make it, so plan accordingly.
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Low Carb Cheesy Tuna Casserole
- Total Time: 35 minutes
- Yield: 4 1x
Description
A delicious and satisfying low carb cheesy tuna casserole that’s perfect for a quick and healthy meal. Packed with tender tuna, creamy cheese, and low carb vegetables, this casserole is easy to prepare and perfect for anyone watching their carb intake.
Ingredients
2 tablespoons olive oil
1 small onion, finely chopped
2 cloves garlic, minced
1 cup cauliflower florets, chopped into small pieces
1 cup broccoli florets, chopped into small pieces
1 (5 ounce) can tuna in water, drained
1/2 cup sour cream
1/2 cup mayonnaise
1 cup shredded sharp cheddar cheese, divided
1/4 cup grated Parmesan cheese
1 teaspoon Dijon mustard
1/2 teaspoon dried thyme
1/2 teaspoon salt
1/4 teaspoon black pepper
Instructions
Preheat the oven to 375°F (190°C).
Heat the olive oil in a large skillet over medium heat.
Add the chopped onion and cook for 3-4 minutes until softened.
Add the minced garlic and cook for another 1 minute until fragrant.
Add the chopped cauliflower and broccoli florets to the skillet and cook for 5-6 minutes until tender but still crisp.
Remove the skillet from heat and transfer the cooked vegetables to a large mixing bowl.
Add the drained tuna, sour cream, mayonnaise, half of the shredded cheddar cheese, Parmesan cheese, Dijon mustard, dried thyme, salt, and black pepper to the bowl.
Stir all ingredients together until well combined.
Transfer the mixture to a greased 8×8 inch baking dish and spread evenly.
Sprinkle the remaining shredded cheddar cheese evenly over the top.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly and the casserole is heated through.
Remove from the oven and allow to cool for 5 minutes before serving.
- Prep Time: 10 minutes
- Cook Time: 25 minutes
Don’t worry about fancy kitchen gadgets here—just a skillet and a baking dish will do. I sometimes swap out the broccoli or cauliflower for whatever low carb veggies I have on hand, like zucchini or green beans, though I haven’t tried all possible combos yet. If you want it a bit tangier, a splash of extra Dijon mustard works well. For a lighter touch, cutting back on the mayonnaise or sour cream makes it less rich but still tasty. Serving it alongside a crisp green salad or some pickled veggies adds a nice contrast that I appreciate.
FAQ
Can I make this ahead of time? You can prepare the mixture in advance and refrigerate it, but bake it fresh for the best texture. Leftovers keep well for a few days but don’t freeze them.
Is this recipe good for picky eaters? It’s fairly mild and creamy, which tends to go over well, but the tuna flavor is noticeable. You might want to test a small portion first.
Can I use canned salmon or chicken instead? I haven’t tried it myself, but swapping the tuna for another cooked protein could work, just adjust seasonings as needed.
If you’re ready for a cozy dinner that doesn’t require a lot of fancy moves, this casserole’s waiting. Save it, print it, and let it become part of your weeknight routine.