Easy Keto Tuna Casserole: Creamy, Cheesy & Kid Approved!

If you’re craving serious comfort food but keeping carbs low, you’ve just found your new favorite dinner Keto Tuna Casserole, This dish takes everything you love about the classic tuna casserole (creamy sauce, melty cheese, and hearty texture) and gives it a low-carb makeover the whole family will devour.

Whether you’re managing your macros, following keto strictly, or just looking for a simple, satisfying weeknight meal, this casserole checks all the boxes. It’s quick to prepare, budget-friendly, freezer-friendly and best of all even picky eaters love it. My kids ask for seconds every time!

In this recipe, I’ll show you exactly how to make a creamy, cheesy keto tuna casserole that tastes just like the comfort food classic you remember. Plus, I’ll share tips for keeping it from getting watery (a common keto casserole problem) and ways to customize it to fit your family’s tastes.

Ready to dig into delicious keto comfort? Let’s get cooking!

Why You’ll Love This Keto Tuna Casserole

Here’s why this casserole will quickly become a go-to recipe in your keto meal rotation:

• Creamy and cheesy – Satisfies that comfort food craving without the carbs.
• Low carb – Only 5g net carbs per serving, making it perfect for keto and low-carb lifestyles.
• Kid-approved – Even picky eaters can’t resist the creamy, cheesy goodness!
• Quick and easy – Ready in just 30 minutes, ideal for busy weeknights.
• Budget-friendly – Uses simple pantry staples like canned tuna, cheese, and eggs.
• Meal prep and freezer friendly – Make it ahead or freeze leftovers for a stress-free dinner anytime.

Whether you’re new to keto or a seasoned low-carb pro, this casserole delivers big flavor with minimal effort. Plus, it’s versatile, you can easily tweak the ingredients to suit your family’s taste or dietary needs.

Ingredients You’ll Need

One of the best things about this easy keto tuna casserole is how simple and flexible the ingredient list is. Most items are probably already in your kitchen, or easy to grab on your next grocery run. Plus, every ingredient is carefully chosen to keep carbs low while maximizing creamy, cheesy comfort.

Here’s what you’ll need

🐟 Canned Tuna

Choose tuna packed in water or olive oil. It’s affordable, packed with protein, and perfect for quick recipes like casseroles. Tuna adds heartiness and rich, savory flavor without adding unnecessary carbs.

Why it works:
Tuna is naturally low in carbs and high in omega-3 fatty acids, which many people on keto seek out for heart and brain health. It’s also a budget-friendly protein source.

🧀 Cheddar Cheese

You’ll want sharp cheddar cheese for that bold, melty goodness. For even more flavor and texture, you can combine it with other keto-friendly cheeses like mozzarella or Monterey Jack.

Pro Tip:
Pre-shredded cheese is convenient, but it often contains added starches to prevent clumping. For the smoothest melt and lowest carb count, shred your own if you have the time!

🥄 Cream Cheese

Cream cheese is the secret to the casserole’s rich, creamy base. Unlike flour or starch thickeners used in traditional casseroles, cream cheese keeps it low-carb while adding a velvety texture.

🥦 Cauliflower (optional)

Want a little more bulk or a noodle-like texture? Add cauliflower florets, either fresh or frozen. Cut them into small, bite-sized pieces and lightly steam them before mixing into the casserole.

Why it works:
Cauliflower is a keto staple because it’s low in carbs, high in fiber, and absorbs the creamy, cheesy flavors of the dish without making it watery.

🥚 Eggs

Eggs act as a natural binder to hold the casserole together. They also boost the protein content, making the dish even more satisfying and keto-friendly.

🥛 Heavy Cream

Heavy cream brings that luxurious, silky creaminess to the sauce. Unlike milk, it’s low in carbs and high in fat, perfect for keto recipes.

Note:
If you need a lighter or dairy-free option, substitute unsweetened almond milk or full-fat coconut cream.

🧂 Seasonings

A simple blend of salt, black pepper, garlic powder, and onion powder elevates the flavor without overpowering the dish. These seasonings add just the right savory depth that keeps everyone coming back for seconds.

Ingredient Substitutions & Variations (Teaser, full details below!)

Want to add more veggies, switch up the cheeses, or make this casserole dairy-free? Don’t worry, I’ve got tons of easy substitution tips and variations coming up in the next section.

Stay tuned for customization ideas to make this casserole perfect for your taste and dietary needs!

Ingredient Substitutions & Variations

One of the best things about this keto tuna casserole (besides how creamy and cheesy it is!) is how customizable it can be. Whether you’re working with what’s in your pantry or adjusting for dietary preferences, this casserole can flex to fit your needs.

Here are some simple swaps and creative twists to truly make this recipe your own:

🔄 Dairy-Free Option

Following a dairy-free or lactose-light lifestyle? No problem.

• Cream cheese swap: Use a dairy-free cream cheese alternative or full-fat coconut cream for the creamy base. Both provide a rich texture without the dairy.
• Cheese substitute: Look for a dairy-free shredded cheese blend designed to melt well (mozzarella-style dairy-free blends often work best).
• Tip: Add a pinch of nutritional yeast to enhance the cheesy flavor without the cheese.

Why it works: Coconut cream and dairy-free cheeses can maintain creaminess while keeping carbs low and flavor high.

🧀 Cheese Variations

Feel like mixing up the cheese game? The type of cheese you choose can add a whole new layer of flavor and personality to your casserole.

• Stretchy melt: Combine cheddar and mozzarella for a classic melty texture.
• Bold flavor: Add a touch of Parmesan or Gruyère for a nutty, sophisticated flavor boost.
• Spicy kick: Swap in Pepper Jack or a spicy chipotle cheddar for those who like a little heat.

Pro Tip: Always shred your own cheese when possible to avoid hidden carbs from anti-caking agents in pre-shredded varieties.

🌶 Add Some Heat

If you like your casseroles with a little kick, it’s easy to spice things up:

• Jalapeños: Finely chopped and mixed into the casserole or layered on top.
• Cayenne pepper: A pinch goes a long way.
• Hot sauce: Add a few dashes of your favorite keto-friendly hot sauce before baking or drizzle on after cooking.

Bonus: A spicy version also pairs beautifully with a cool keto-friendly ranch dressing or sour cream topping.

🥦 Vegetable Add-Ins

Want to sneak in more veggies or bulk up the dish? Keto-friendly veggies are your friend.

• Spinach: Chop and sauté before adding to avoid excess moisture.
• Broccoli: Steam until just tender and chop into small pieces.
• Zucchini: Slice, lightly salt, and pat dry before mixing in.

Tip: Always sauté or steam veggies first to reduce moisture and prevent a watery casserole.

🐟 Fresh Tuna Instead of Canned

Yes, you can absolutely use fresh tuna!

If you have fresh tuna steaks or fillets on hand, cook them through, flake the meat, and use it just like canned tuna in the recipe. It adds a slightly different texture and flavor, plus it’s a great way to use up leftovers.

Why it works: Fresh tuna keeps the recipe hearty and maintains the low-carb, high-protein balance that keto eaters love.

🥜 Nut-Free Adjustment

Good news: this recipe is already nut-free!

That said, if you use any pre-made spice blends or cheese substitutes, always double-check the ingredient lists. Some spice blends and alternative cheeses can sneak in nut-based stabilizers or thickeners.

Tip: For anyone with severe allergies, making your own spice blends is always the safest option.

Step-by-Step Instructions

Making this creamy, cheesy keto tuna casserole couldn’t be easier. With just a few simple steps, you’ll have a satisfying, low-carb comfort dish ready in about 30 minutes. Perfect for busy weeknights or lazy Sundays!

Here’s exactly how to do it:

1️⃣ Preheat the Oven

Set your oven to 375°F (190°C).

Lightly grease a medium-sized casserole dish with butter or cooking spray. This prevents sticking and makes clean-up easier.

Pro Tip: If you prefer crispier edges, use a glass or ceramic baking dish.

2️⃣ Prep the Ingredients

Drain the tuna thoroughly.

• Place the tuna in a strainer or press it gently with a spoon to remove as much water or oil as possible.
• Flake it with a fork into small pieces. This helps distribute the tuna evenly throughout the casserole.

If using cauliflower:

• Steam lightly for 3 to 5 minutes until just tender.
• Chop into small, bite-sized pieces.

Shred the cheese.

• Freshly shredded cheese melts better and has no added starches, keeping the carb count lower.

3️⃣ Mix the Creamy Base

In a large mixing bowl, combine the following:

• 4 oz (half a block) cream cheese (softened)
• 1/2 cup heavy cream
• 2 large eggs
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon garlic powder
• 1/2 teaspoon onion powder

Whisk until the mixture is smooth and creamy.

Why this step matters:
A smooth base ensures even cooking and a consistent, creamy texture in every bite.

4️⃣ Add Tuna & Cheese

Fold the flaked tuna and half of the shredded cheese into the creamy mixture.

If adding cauliflower or extra veggies, fold them in gently now.

Pro Tip: Make sure the tuna and veggies are evenly coated for a perfect, creamy consistency.

5️⃣ Assemble the Casserole

Pour the mixture into your prepared casserole dish.

Sprinkle the remaining cheese evenly over the top.

Optional: For an extra layer of texture, you can add a light sprinkle of low-carb breadcrumbs (almond flour-based) or crushed pork rind substitutes, but this step is completely optional!

6️⃣ Bake

Slide the casserole into the oven and let it bake for about 20 to 25 minutes until it’s perfectly set and bubbling.

You’ll know it’s ready when:
✅ The casserole is set in the center.
✅ You see bubbling around the edges.
✅ The cheese looks melted and delicious!

7️⃣ Optional: Broil for a Golden Top

For a beautiful, golden-brown cheesy crust:

• Turn the broiler on high.
• Broil for 2 to 3 minutes.
• Keep a close eye to prevent burning, the cheese can brown quickly!

8️⃣ Serve & Enjoy!

Remove from the oven and let the casserole cool slightly for 5 minutes.

This allows the casserole to firm up, making it easier to slice and serve.

Dish it up and enjoy a warm, comforting serving of creamy, cheesy keto tuna casserole, kid-approved and keto-perfect!

Pro Tips for the Perfect Keto Tuna Casserole

Want to make sure your casserole turns out creamy, flavorful, and family-approved every time? Here are a few expert tips:

💡 Drain the Tuna Well

Excess liquid can make the casserole watery. Press the tuna gently with the back of a spoon or use a strainer to get rid of as much moisture as possible.

💡 Use Room Temperature Cream Cheese

Softened cream cheese mixes more easily, creating a smoother, creamier base without lumps.

💡 Freshly Shred Your Cheese

Store-bought shredded cheese usually includes anti-caking additives, which can stop it from melting evenly. If possible, shred your own for the best melt and texture.

💡 Don’t Overcook the Cauliflower

If you’re adding cauliflower, lightly steam it until just tender. Overcooking will make it mushy and release too much moisture into the casserole.

💡 Let It Rest Before Serving

Allow the casserole to sit for 5 minutes after baking. This helps it firm up, making it easier to slice and serve.

💡 Season to Taste

Don’t be afraid to adjust the salt, pepper, or add extra garlic powder to suit your family’s preferences.

Storage, Freezing & Reheating Tips

One of the best parts about this keto tuna casserole? It stores beautifully, making it perfect for meal prep or saving leftovers for busy nights.

Here’s how to keep it fresh and delicious:

🧊 Storage

• Refrigerator: Cover the cooled casserole tightly with foil or transfer to an airtight container. Store in the fridge for up to 4 days.
• Tip: Keep toppings (like extra cheese or crunchy low-carb crumbs) separate if planning to store.

❄️ Freezing

• Before baking: Assemble the casserole in a freezer-safe dish. Cover tightly with plastic wrap and foil. Freeze for up to 3 months.
• After baking: Cool completely, then wrap and freeze individual portions or the whole dish.
• Pro Tip: Label with the date for easy tracking.

🔥 Reheating

• Refrigerated casserole: Reheat in a 350°F oven for 10-15 minutes or until warmed through.
• Frozen casserole: Thaw overnight in the refrigerator before baking or reheating.
• Microwave option: For individual portions, microwave on medium power for 2-3 minutes, checking halfway.

Macros & Nutritional Information

For anyone following a keto or low-carb lifestyle, tracking macros is key. Here’s the nutritional breakdown per serving of this creamy, cheesy keto tuna casserole:

Nutrient	Amount (per serving)
Calories	320
Protein	28g
Fat	22g
Total Carbohydrates	6g
Fiber	1g
Net Carbs	5g

Macros are approximate and will vary depending on specific brands and any substitutions used.

🔎 Why Macros Matter for Keto

Keeping net carbs low while prioritizing healthy fats and protein supports ketosis, the metabolic state that helps many people burn fat for fuel. This casserole delivers balanced macros that fit into most standard or even stricter keto plans.

Frequently Asked Questions

Conclusion

If you’ve been looking for a creamy, cheesy, and family-friendly keto dinner, this Easy Keto Tuna Casserole delivers it all, and then some. With just a few simple ingredients, minimal prep, and tons of flavor, it’s the perfect solution for busy weeknights or whenever those comfort food cravings hit.

Whether you stick to the classic recipe or explore some of the customizations and variations we covered, this casserole is sure to become a repeat favorite at your table. Plus, it’s low-carb, budget-friendly, and even picky eaters will ask for seconds!

💬 Now it’s your turn!

Did you try this recipe? Have a favorite variation or tip to share?
👉 Drop a comment below, I’d love to hear how it turned out for you!

And don’t forget to bookmark or pin this recipe so you can come back to it anytime.

🥘 Love This Recipe? Try These Comforting Favorites Next!

If you enjoyed this Easy Keto Tuna Casserole, you’ll love these other satisfying, family-friendly recipes from the blog:

• 🍠 Paula Deen’s Sweet Potato Casserole A classic, crowd-pleasing side dish.
• 🌽 Paula Deen’s Corn Casserole Sweet, creamy, and perfect for any occasion.
• 🍗 Longhorn Parmesan Chicken Crispy, cheesy, and packed with flavor.
• 🧀 Paula Deen’s Crockpot Macaroni and Cheese Creamy and easy, a perfect pairing for any main dish.
• 🍝 Chicken Spaghetti with Velveeta Cheese and Rotel A cheesy, comforting pasta bake the whole family will love.

👉 Explore more comforting casseroles and family meals on the Deen Recipes Blog!