Let’s talk about those chaotic weeknights when you want a meal that feels comforting, but you also want to keep your family’s health on track. Enter the humble tuna casserole.
Growing up, many of us ate the classic version made with canned cream of mushroom soup. While it was delicious, it wasn't exactly packed with clean ingredients. Today, I’m sharing a reimagined, gluten-free tuna casserole that swaps out the heavily processed canned soup for a simple, rich, made-from-scratch sauce.
Don't let "from scratch" intimidate you! As a homemaker, I am all about practicality. This dish uses simple pantry staples, sneaks in a whole protein boost with bone broth, and comes together in just one pan before hitting the oven. It is cheerful, comforting, and guaranteed to satisfy everyone at your table.
Why You’ll Love This Recipe
Bone Broth Boost: Using bone broth instead of regular broth adds an easy punch of gut-healthy protein and collagen for growing kids.
No Canned Soups: We use a simple cornstarch slurry and whole milk to get that ultra-creamy texture without the preservatives.
Flexible Toppings: No expensive gluten-free breadcrumbs required! I’ll show you how to use what you already have in your kitchen.
Gluten-Free Tuna Casserole
Prep time: 15 minutes
Cook time: 30 minutes
Servings: 6-8
Ingredients
The Base:
12 ounces dry pasta (I highly recommend Jovial Gluten Free Fusilli—it holds up beautifully!)
4 cans tuna, drained
1 small onion, finely diced
3 garlic cloves, minced
10 ounces mushrooms, sliced
2 tsp dried thyme
Salt and pepper, to preference
The Creamy Sauce:
2 cups broth (Use bone broth for extra protein and health benefits!)
1 cup whole milk
1/4 cup cornstarch (for thickening)
2 tbsp vinegar (White balsamic gives it a lovely, bright flavor profile)
The Mix-ins & Topping:
1 cup peas (Optional: mix them right in or serve on the side if you have picky eaters)
1–2 cups grated cheese (A combination of sharp cheddar and fresh Parmesan is perfection)
1 cup breadcrumbs of choice (See homemade notes below)
Instructions
Step 1: Prep the Oven and Pasta
Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish and set it aside. Cook your gluten-free pasta according to the package instructions until it is just al dente. Homemaker tip: Don’t forget to generously salt your pasta water! It’s your only chance to flavor the inside of the noodle. Drain and set aside.
Step 2: Build the Flavor Base
In a large skillet, sauté your diced onion and minced garlic in a small amount of cooking oil or spray oil until fragrant. Toss in the sliced mushrooms and cook until they are nice and soft.
Step 3: Thicken the Sauce
Stir in the dried thyme and bone broth, bringing the mixture to a gentle simmer. In a small cup, mix your cornstarch with a splash of cold water to create a smooth slurry. Slowly pour this slurry into the simmering broth, stirring constantly. Let it come to a low simmer—you’ll see it start to thicken up beautifully right before your eyes!
Step 4: Make it Creamy and Add the Tuna
Stir in the whole milk and white balsamic vinegar. Next, open your cans of tuna and break the fish into small bite-sized pieces directly into the sauce. Let the whole mixture simmer for about 5 minutes, stirring occasionally.
The Salt Balance Rule: Taste your sauce here and season with salt and pepper. Keep in mind that this sauce will be coating your pasta, so having it taste just a tiny bit salty on its own is actually a good thing. You can't take salt back once it's in, so trust your taste buds! If you are using peas, stir them in now.
Step 5: Assemble and Bake
Combine your tuna sauce and cooked pasta together. Depending on the size of your skillet, you can mix it right in the pan or toss them together directly inside your greased 9×13 dish.
Evenly sprinkle your breadcrumbs over the top, followed by a generous layer of your shredded cheddar and Parmesan cheese. Pop it in the oven for 30 minutes until bubbling and golden. If the cheese is browning faster than you'd like, just tent it loosely with aluminum foil.
The Crunch Factor: Smart Breadcrumb Notes
You don't need to make a special trip to the store for gluten-free breadcrumbs! Here are two practical ways to handle the topping with what you have on hand:
The Leftover Bread Method: Take two slices of gluten-free bread (the drier and older, the better!). Cut them up very finely into tiny cubes and sprinkle them right on top. As the casserole bakes, the oven air dries them out completely, giving you that perfect, nostalgic crunch.
The Low-Carb Alternative: If you want to cut back on carbs or add healthy fats, mix 1/2 cup almond flour with 1 tsp melted butter and sprinkle that over the top instead.
Nutritional Profile & Yield
Planning your weekly meals or tracking your daily macros? Here is what a standard, comforting batch of this classic casserole looks like under the hood:
• Total Yield: 6 hearty servings
• Serving Size: Approximately 1.5 cups (approx. 275g)
Estimated Macros Per Serving
• Calories: 380 kcal
• Protein: 26g
• Carbohydrates: 38g
• Fat: 14g
• Fiber: 2g
Note: Nutritional values are estimates based on standard preparations using canned tuna in water, egg noodles, condensed cream of mushroom soup, and a moderate cheese topping. Your actual numbers may vary slightly depending on the specific ingredient brands or modifications you use!
Chat With Me!
This dish is a weekly lifesaver in my home because it checks all the boxes: healthy, budget-friendly, and incredibly comforting.
Do your kids love peas mixed in, or are they strictly team "on the side"? Let me know your family's casserole preferences in the comments below! Don't forget to pin this recipe to your healthy weeknight dinner board!
