Name: Keto Tuna Zoodle Casserole Recipe
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: American
Ingredients: 4 medium zucchini, spiralized; 1/2 small onion, diced; 2 garlic cloves, minced; 2 tbsp chopped parsley; 2 cans tuna, drained; 225 g cream cheese, softened; 1/2 cup heavy cream; 1 cup shredded cheddar cheese; 1/2 cup shredded mozzarella cheese; 2 tbsp grated Parmesan cheese; 2 tbsp olive oil; 1 tbsp Dijon mustard; 1/2 tsp dried thyme; 1/2 tsp garlic powder; Salt and black pepper, to taste

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If you have been searching for a comforting yet guilt-free dinner, look no further than this Keto Tuna Zoodle Casserole Recipe. It’s a delightful twist on the traditional tuna noodle casserole, swapping in fresh zucchini noodles for pasta, making it perfectly keto and low-carb friendly. Creamy, cheesy, and packed with tender tuna and herbs, this casserole is a beautiful blend of textures and flavors that will make you forget you’re eating a health-conscious meal. Each bite offers that warm, satisfying feeling of home cooking while keeping your carb count in check.

Ingredients You’ll Need

The image shows several white bowls and small dishes arranged on a white marbled surface. The largest bowl in the top left contains long thin green and pale yellow spiralized vegetable strands. To the right is a medium white bowl filled with light brown shredded meat. Below it, a smaller white bowl has thick white creamy sauce. Another white bowl near the bottom left holds shredded orange cheese. Next to it is a small bowl of chopped light green celery. There are three garlic cloves placed beside this bowl. At the bottom left, there are three small dishes containing white salt and black pepper, green dried herb, and a beige creamy sauce. At the top, there is a whole light brown onion. The setting is simple with clean, fresh-looking ingredients. photo taken with an iphone --ar 4:5 --v 7

What’s wonderful about this recipe is how simple yet essential each ingredient is. They come together to create a creamy, luscious texture and a flavor profile that’s deeply satisfying without relying on carbs. From zucchini’s fresh crunch to cheese’s gooey goodness, every component has a starring role.

4 medium zucchini, spiralized: These create the “noodles” that keep it light and low-carb while offering great texture.
2 cans tuna, drained: The protein powerhouse that makes this dish hearty and filling.
2 tbsp olive oil: Adds richness and helps soften the onions perfectly.
1/2 small onion, diced: Brings subtle sweetness and depth to the casserole’s base.
2 garlic cloves, minced: A punch of aromatic flavor that wakes up the entire dish.
225 g cream cheese, softened: For that creamy, velvety sauce that binds everything beautifully.
1/2 cup heavy cream: Adds extra richness and smoothness to the casserole.
1 tbsp Dijon mustard: A mild tang that complements the tuna perfectly and lifts the flavor.
1/2 tsp dried thyme: Infuses an earthy, herbal note.
1/2 tsp garlic powder: Enhances the garlic flavor for extra depth.
Salt and black pepper: Essential seasonings to bring all the ingredients together.
1 cup shredded cheddar cheese: Adds sharpness and melts into a golden, bubbly topping.
1/2 cup shredded mozzarella: Creates stretchy, gooey cheese pulls that everyone loves.
2 tbsp grated Parmesan: A nutty, savory kick that browns beautifully on top.
2 tbsp chopped parsley: Freshness to brighten and garnish the final dish.

How to Make Keto Tuna Zoodle Casserole Recipe

Step 1: Prepare the Zucchini Noodles

Start by spiralizing your zucchini into noodles—these zoodles are the heart of the casserole. Place them in a colander, sprinkle lightly with salt, and let them sit for 10 minutes. This step is crucial because it draws out excess water, preventing the casserole from becoming soggy. Afterward, squeeze the zoodles gently to remove any lingering moisture.

Step 2: Sauté the Aromatics

Heat olive oil in a skillet over medium heat and add the diced onions. Let them cook for about 3 to 4 minutes until they soften and turn translucent. Next, toss in the minced garlic and cook for about 30 seconds until fragrant. These softened aromatics build the foundational flavor that enhances the whole dish.

Step 3: Make the Creamy Sauce

To the skillet, add the softened cream cheese and heavy cream, stirring constantly until smooth and luscious. Now, stir in Dijon mustard, dried thyme, garlic powder, salt, and black pepper. This sauce will envelop the tuna and zucchini noodles, creating that crave-worthy creaminess throughout the casserole.

Step 4: Combine Tuna and Zoodles

Gently fold the drained tuna into the creamy sauce, being careful not to break it up too much—you want tender chunks in every bite. Then, carefully incorporate the prepared zucchini noodles, ensuring they’re evenly coated in the savory sauce.

Step 5: Assemble and Bake

Spoon the mixture into a greased baking dish, spreading it into an even layer. Sprinkle the shredded cheddar, mozzarella, and Parmesan cheeses evenly on top. Bake in a preheated oven at 190°C for 20 to 25 minutes, or until the casserole is bubbling and the cheese has turned a beautiful golden brown.

Step 6: Garnish and Serve

Once out of the oven, sprinkle with freshly chopped parsley for a vibrant color and burst of freshness. Serve warm and enjoy the comforting, creamy goodness that this Keto Tuna Zoodle Casserole Recipe brings to your dinner table.

How to Serve Keto Tuna Zoodle Casserole Recipe

A rectangular white ceramic dish is filled with a layered casserole. The bottom layer is mixed shredded green and white vegetables, possibly zucchini and onions, creating a fresh textured base. This is topped with creamy white sauce spread evenly across the dish. The top layer consists of bright orange shredded cheese scattered generously, with some cheese melting into the sauce below. The dish rests on a white marbled surface, showing a clear view from above. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh parsley is the perfect finishing touch, offering a pop of green and a fresh bite that contrasts beautifully with the casserole’s richness. You could also try a sprinkle of red pepper flakes for a gentle heat kick or some lemon zest to brighten flavors if you love a little zing.

Side Dishes

This casserole is a complete meal on its own, but pairing it with a crisp green salad dressed in a light vinaigrette or some steamed low-carb veggies like asparagus or sautéed spinach adds even more nutrition and texture to your plate.

Creative Ways to Present

If you want to impress guests or add variety, serve the casserole in individual ramekins or mini cast-iron skillets. You could also layer the ingredients in a clear glass dish for a pretty visual effect before baking. Adding a crunchy topping of crushed pork rinds before baking is a fun twist that adds texture and an extra savory touch.

Make Ahead and Storage

Storing Leftovers

Leftover Keto Tuna Zoodle Casserole Recipe keeps beautifully in an airtight container in the refrigerator for up to 3 to 4 days. The flavors may even deepen overnight, making it an easy, delicious lunch option when reheated.

Freezing

To freeze, place the casserole in a freezer-safe dish and cover tightly with foil or plastic wrap. It will keep for up to 2 months. When ready to enjoy, thaw overnight in the refrigerator before reheating to maintain the best texture and flavor.

Reheating

Reheat leftover casserole in the oven at 175°C for about 15-20 minutes until warmed through and the cheese melts again. Alternatively, microwave portions on medium power in short intervals to prevent drying out.

FAQs

Can I use fresh tuna instead of canned for this recipe?

While you can use fresh tuna, the canned version is more convenient and maintains the flaky texture that works best in this casserole. If using fresh, be sure to cook and shred it before mixing.

What can I add to make the casserole more vegetable-packed?

Adding chopped mushrooms, spinach, or broccoli folds in extra nutrients and flavor without compromising the keto-friendly nature of the dish. Just sauté these veggies lightly before mixing in.

Is it important to remove moisture from the zucchini noodles?

Absolutely. Zucchini has high water content, so squeezing out the excess moisture prevents the casserole from becoming watery and soggy, ensuring it bakes up perfectly creamy and comforting.

Could I make this recipe dairy-free?

Replacing the cheeses and creams with dairy-free alternatives is possible but will alter the texture and richness. Coconut cream and dairy-free cream cheese can work, but be prepared for a slightly different flavor profile.

How spicy is this casserole?

This Keto Tuna Zoodle Casserole Recipe is mild and savory with no inherent spiciness. You can easily adjust the heat by adding chili flakes or hot sauce if you enjoy some spice in your meals.

Final Thoughts

This Keto Tuna Zoodle Casserole Recipe is an absolute game-changer for anyone craving a comforting, creamy casserole without the carb overload. It’s easy to make, packed with flavor, and wonderfully satisfying. Whether for a weeknight dinner or batch cooking for the week, it’s sure to become a favorite in your keto recipe collection. Give it a try—you might just find your new go-to comfort food.