Keto tuna casserole is a timeless comfort dish reimagined for a low-carb lifestyle. With succulent tuna, creamy textures, and balanced flavors, it’s perfect for busy weeknights or cozy weekends. This easy keto tuna casserole offers a mouthful of nostalgia while maintaining modern dietary preferences.
In this tuna casserole with mayo, the velvety sauce pairs beautifully with tender riced cauliflower, ensuring every bite delights. Whether you’re seeking an indulgent yet healthful meal or a crowd-pleaser, this keto tuna casserole recipe is a must-try. Let’s dive in and discover its irresistible charm.
Table of contents
Reasons to Love This Recipe
- Effortless Preparation: From mixing to baking, each step in this easy keto tuna casserole feels natural and uncomplicated, making it perfect even for kitchen novices.
- Hearty and Nourishing: Every forkful bursts with protein, healthy fats, and nutrient-dense vegetables. You get all the comforts of a traditional tuna casserole with mayo but without the hefty carb load.
- Versatile Flavors: Whether you tweak the cheese or add an extra crunch on top, this keto tuna casserole recipe adapts to your preferences.
I fondly recall my mother serving a nostalgic tuna casserole with mayo at family gatherings, so this remake warms my heart each time I prepare it. The sauce is what truly sets this keto tuna casserole recipe apart, delivering that luscious bite reminiscent of old-fashioned tuna casserole with mayo.
Ingredients
- 2 (5-ounce) cans tuna in water: Drained and flaked, offering a tender, savory base.
- 1 cup cooked riced cauliflower: A low-carb alternative to pasta, adding a subtle texture.
- ½ cup mayonnaise: This is key for creaminess; opt for full-fat for the richest flavor.
- 1 tablespoon Dijon mustard: Enhances tanginess and depth without overpowering.
- ½ cup Gruyere cheese (shredded, divided): Melty and rich, though cheddar or provolone can substitute.
- ¼ cup red onion (minced): Adds a sweet, mild bite.
- ¼ teaspoon sea salt: Balances out the flavors; feel free to adjust.
- ¼ teaspoon black pepper: A simple spice that pairs wonderfully with tuna.
- ¼ teaspoon cayenne pepper: Lends a gentle heat for complexity, but optional if you prefer mild.
- ¼ cup parsley (chopped, for garnish): Brings freshness and a pop of color to your keto tuna casserole.
Substitutions
When making this keto tuna casserole, you may need to accommodate different dietary needs, ingredient availability, or flavor preferences. Below are some practical swaps that won’t compromise taste or texture:
- Tuna: Replace with cooked, shredded chicken for a milder flavor; or swap in canned salmon for a richer taste. Both options maintain protein content while altering the flavor profile slightly.
- Riced Cauliflower: For those who dislike cauliflower or want variation, try shredded zucchini, chopped broccoli, or diced mushrooms. Adjust cooking time as these veggies may release more liquid.
- Mayonnaise: If you’re avoiding mayo, Greek yogurt or sour cream can deliver tanginess with similar creaminess. For a dairy-free option, use coconut cream or mashed avocado (though the flavor will be more pronounced).
- Gruyere Cheese: Sharp cheddar, mozzarella, Swiss, or even a dairy-free cheese work as alternatives. Cheddar provides a stronger bite, while mozzarella is milder and gooier.
- Dijon Mustard: Swap for yellow mustard if that’s what you have on hand, or go for whole-grain mustard for extra texture. Mustard powder can also work; start with half the amount and taste-test.
- Red Onion: White onion or shallots are solid replacements, offering similar sweetness. Dried onion flakes can add flavor, but use sparingly to avoid overpowering the dish.
- Cayenne Pepper: If you prefer less heat, use paprika or simply omit. For more spice, try chili flakes or chipotle powder.
These substitutions are straightforward, ensuring your casserole remains low-carb, satisfying, and easy to prepare. Feel free to mix and match based on your personal needs!
How to Make Keto Tuna Casserole
Time needed: 35 minutes
- Gather and Preheat
Preheat your oven to 375°F (190°C). Simultaneously, assemble all your ingredients on the countertop.
- Combine the Base
In a medium mixing bowl, place the flaked tuna, cooked riced cauliflower, and minced red onion. Gently fold them together to distribute each ingredient evenly.
- Create the Creamy Mixture
In a separate bowl, whisk together the mayonnaise, Dijon mustard, and half of the shredded Gruyere cheese. Season with sea salt, black pepper, and cayenne pepper. Taste-test the mixture so you can adjust the salt or heat level as desired.
- Unify Everything
Pour the mayonnaise-mustard-cheese mixture over the tuna, cauliflower, and onion in the mixing bowl. Use a spatula or large spoon to fold until every morsel is coated in the creamy sauce
- Transfer to a Baking Dish
Lightly grease a casserole dish or coat it with cooking spray. Transfer the mixture into the dish, smoothing the top with the back of a spoon, then sprinkle the remaining shredded Gruyere cheese over the surface.
- Bake to Perfection
Slide the casserole dish into the preheated oven and bake for about 20–25 minutes, or until the cheese on top is melted and lightly browned.
- Finish and Garnish
Once the top is golden and the edges bubble, remove your easy keto tuna casserole from the oven. Let it cool for 5 minutes to set. Sprinkle fresh chopped parsley on top for a bright flourish, and serve your keto tuna casserole recipe warm.
Enjoy this dish on its own or pair it with a crisp side salad. The creamy interior offers luxurious comfort, while the bright greenery provides a refreshing contrast. If desired, drizzle a bit of hot sauce for an extra zing.
Expert Tips to Make It Perfect
- Opt for Full-Fat: Using full-fat mayo maximizes the creaminess factor in your tuna casserole with mayo. Low-fat alternatives can sometimes make the texture watery.
- Dry Your Tuna Thoroughly: If your canned tuna is too moist, pat it dry with a paper towel before mixing. This guarantees a beautifully cohesive easy keto tuna casserole.
- Experiment with Toppings: Add pork rind crumbs or almond flour crumbs on top before baking to create a crunchy layer for your keto tuna casserole recipe.
- Adjust the Heat: If you crave a bolder kick, sprinkle in more cayenne or add a dash of chili flakes. Spicy accents elevate the savory tones of keto tuna casserole delightfully.
How to Store keto Tuna Casserole
- Refrigerate: Transfer leftovers into an airtight container and store in the fridge for up to three days. Reheat gently in the oven or microwave, adding a splash of cream if it looks dry.
- Freeze: Portion your keto tuna casserole in freezer-safe containers. Thaw overnight in the fridge, then bake or microwave until heated through. This ensures minimal waste and quick meals later on.
Conclusion
There’s something soul-satisfying about whipping up a warm, cheesy keto tuna casserole that captures classic flavors without the carbs. This easy keto tuna casserole checks every box: it’s comforting, conveniently adaptable, and irresistibly delicious. Embrace the nostalgia of tuna casserole with mayo in a healthier, low-carb form, and treat yourself to a family-friendly meal that never disappoints. Feel free to add personal twists, then share your delightful discoveries with fellow tuna fans. Enjoy every moment of this keto tuna casserole recipe adventure!
After enjoying this rich and cheesy keto tuna casserole, why not satisfy your sweet tooth the healthy way? Try The Ultimate Vegan Fudge Recipe: Creamy, Easy, and Guilt-Free! for a deliciously indulgent finish.
And if you’re looking for a light, protein-packed snack to pair with it, check out Turkey Pinwheels: The Effortless Snack Everyone Will Love, a quick and tasty option that’s perfect for any occasion!
PrintQuick Keto Tuna Casserole: Deliciously Low-Carb!
This irresistibly creamy keto tuna casserole is a low-carb twist on a classic. It combines succulent tuna, velvety mayonnaise, tender riced cauliflower, and a golden layer of Gruyere cheese. The result is a comforting dish that’s both nostalgic and health-conscious, perfect for weeknights or gatherings.
- Prep Time: 10 minutes
- Cook Time: 25 minutes
- Total Time: 35 minutes
- Yield: 4 servings 1x
- Category: Dinner
- Method: Baking
- Cuisine: American
Ingredients
- 2 (5-ounce) cans tuna in water, drained and flaked
- 1 cup (100g) cooked riced cauliflower
- ½ cup (120g) mayonnaise
- 1 tablespoon (15ml) Dijon mustard
- ½ cup (50g) shredded Gruyere cheese, divided
- ¼ cup (40g) red onion, minced
- ¼ teaspoon (1.25g) sea salt
- ¼ teaspoon (1.25g) black pepper
- ¼ teaspoon (0.5g) cayenne pepper
- ¼ cup (15g) parsley, chopped (garnish)
Instructions
- Preheat the Oven: Preheat your oven to 375°F (190°C).
- Mix the Base: In a bowl, combine the drained tuna, cooked riced cauliflower, and minced red onion.
- Make the Sauce: Whisk together mayonnaise, Dijon mustard, half of the Gruyere, salt, black pepper, and cayenne.
- Combine Everything: Pour the sauce over the tuna mixture and fold until fully coated.
- Assemble the Casserole: Transfer to a greased casserole dish and smooth the top.
- Bake Until Golden: Sprinkle the remaining Gruyere on top and bake for 20–25 minutes until golden and bubbly.
- Rest & Serve: Let it rest for 5 minutes, garnish with parsley, and serve warm.
Notes
- Drain Tuna Thoroughly: Too much moisture can make the casserole watery. Press excess liquid out with a paper towel before mixing.
- Use Full-Fat Mayo: For the creamiest texture, opt for full-fat mayonnaise. Low-fat versions may result in a thinner sauce.
- Don’t Overbake: Overbaking can dry out the tuna. Remove from the oven when the cheese is bubbly and golden brown.
Nutrition
- Serving Size: 1 portion
- Calories: 320 kcal
- Sugar: 2g
- Sodium: 680mg
- Fat: 24g
- Saturated Fat: 6g
- Unsaturated Fat: 14g
- Trans Fat: 0g
- Carbohydrates: 3g
- Fiber: 1g
- Protein: 20g
- Cholesterol: 45mg
Common Questions About Keto Tuna Casserole
Absolutely. Simply sear fresh tuna, flake it, and proceed with the recipe. Keep in mind that you might need to season it more, as fresh tuna has a milder taste than what you’d find in a standard tuna casserole with mayo.
Cheddar, Monterey Jack, or even mozzarella can work in this easy keto tuna casserole. Gruyere adds a nutty depth, but feel free to experiment with your favorites.
Definitely. Low-carb veggies like mushrooms, spinach, or zucchini pair wonderfully. Just sauté or steam them first so they don’t release extra water in your keto tuna casserole.
You can add a bit of heavy cream or cream cheese. Both options enhance the velvety texture of your tuna casserole with mayo without adding too many carbs.
If you’re sensitive to tuna flavor, blend in extra spices or aromatic ingredients like garlic and herbs. Also, rinsing and draining your tuna thoroughly can help soften the intensity in this keto tuna casserole recipe.
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