Tuna and Egg Casserole Recipe: Savory Baked Layers With Melted Cheese

This tuna and egg casserole recipe transforms simple ingredients into a hearty, savory dish that’s perfect for brunch or a satisfying dinner. The layered combination of flaky tuna, creamy eggs, and melted cheese creates a rich, comforting texture that’s impossible to resist.

I developed this recipe after realizing how quickly a dish like this could feed a crowd without requiring hours of prep—just assemble, bake, and enjoy.

The secret to this casserole lies in the balance of flavors and textures: tender tuna flakes, velvety egg mixture, and crispy breadcrumbs on top. A touch of lemon zest brightens the dish, while garlic and herbs add depth. The best part?

It bakes at a low temperature, allowing the cheese to melt perfectly while keeping the eggs just set—not runny, not dry. This is the kind of dish that tastes even better the next day, making it ideal for meal prep.

What you’ll end up with is a golden, bubbling casserole that’s easy to slice and serve—ideal for brunch gatherings or a cozy weeknight meal. The aroma of baking cheese and herbs will fill your kitchen, and every bite delivers a satisfying mix of protein, richness, and freshness.

Whether you’re feeding a family or hosting a brunch, this recipe delivers restaurant-quality results with minimal effort.

Pair it with a simple green salad or crusty bread to round out the meal. The versatility of this dish means you can adjust the ingredients to suit your taste—add more vegetables, swap in different cheeses, or even include a layer of potatoes for extra heartiness.

Let’s get started on creating this comforting, crowd-pleasing casserole!

Ingredients for tuna and egg casserole

Six ingredients make this comforting casserole shine with tuna and melted cheese layers.

The tuna is the star here—Wild Planet or Vital Choice brands are my go-to for high-quality flakes. Look for cans with minimal additives, and drain them well to avoid a watery casserole. Fresh parsley and lemon zest might seem small, but they elevate the dish with brightness (trust me, they make the difference). For the cheese, Kraft 2% or Cabot Sharp melt beautifully, but any good cheddar works. The eggs should be large, not extra-large, for consistent baking. If you're prepping ahead, whisk the egg mixture and store it separately until ready to assemble.

No fresh parsley? Dried dill at double the amount works in a pinch, but fresh is ideal. Short on milk? Heavy cream or half-and-half makes it richer, but whole milk keeps it balanced. The panko topping can be made ahead—just mix with melted butter and store in the fridge until ready to use. Want extra crunch? Add crushed Ritz crackers or cornflakes to the breadcrumb mix. The garlic can be pre-minced from a jar if you're short on time, but fresh is always better. If you're watching calories, use low-fat cheese and skim milk without sacrificing flavor.

This casserole reheats beautifully—honestly tastes better the next day once everything melds. Keeps 4-5 days in the fridge, covered tightly. For freezing, assemble it in a baking dish, cover with foil, and freeze for up to 3 months. Thaw overnight in the fridge before reheating. I always make a double batch—one for dinner, one for lunches. The leftovers reheat perfectly in the microwave or oven, just cover with foil to keep the top from drying out.

Step-by-step instructions for tuna and egg casserole

Here's how to build layers of flavor and texture for a satisfying, cheesy baked dish.

In a large bowl, gently combine the 2 cans flaked tuna in water with the 1 tablespoon lemon zest, 1 teaspoon dried dill, 1 teaspoon salt, and 0.5 teaspoon black pepper. You want to mix just until everything is evenly distributed—be careful not to break up the tuna flakes too much. This keeps them tender and fluffy in the final dish.

Next, stir in the 3 cloves minced fresh garlic and the 0.25 cup chopped fresh parsley. The garlic adds depth while the parsley brightens the flavors. Give it one last mix to incorporate everything completely. I like to taste it at this point to adjust seasoning—sometimes the tuna needs a little more salt or lemon zest to really shine.

In a separate medium bowl, whisk together the 8 whole large eggs and 1 cup milk until fully combined. The eggs should be room temperature for even baking. Add the 2 cups shredded cheddar cheese to the egg mixture and stir until the cheese is evenly distributed and begins to melt slightly from the warmth of the eggs.

This step is crucial for creating that creamy, cheesy texture throughout the casserole. If the cheese doesn't melt completely, the casserole will have pockets of unmelted cheese that affect the texture. Stir in the tuna mixture from Step 1 and combine thoroughly. The batter should be thick but pourable—if it's too thick, add a splash more milk to reach the right consistency.

Preheat your oven to 350°F. Lightly grease a 9x13-inch baking dish with 1 tablespoon vegetable oil—this prevents sticking and makes cleanup easier. Pour half of the egg-tuna mixture into the prepared dish and spread it evenly across the bottom.

In a small bowl, mix together the 0.5 cup panko breadcrumbs, 0.25 cup all-purpose flour, and any remaining seasonings. Sprinkle half of this mixture over the egg layer. Then add the remaining egg-tuna mixture and top with the rest of the breadcrumb mixture. The breadcrumbs will create a crispy, golden topping that contrasts beautifully with the creamy layers below.

Place the assembled casserole in the preheated oven and bake for 35-40 minutes, or until the top is golden brown and the center is set. You'll know it's done when the edges pull away slightly from the pan and a knife inserted in the center comes out clean. The cheese should be fully melted with a bubbly surface.

For best results, let the casserole rest for 5 minutes after baking. This allows the layers to set slightly and makes it easier to slice. Serve warm with a side of crusty bread or a simple green salad. The combination of flaky tuna, creamy eggs, and crispy breadcrumb topping makes this dish incredibly satisfying.

Essential equipment for this dish

Baking Dish Essentials

A 9x13-inch baking dish is non-negotiable for this recipe—it provides the perfect surface area for even baking and golden browning. I recommend using a Ceramic or Anodized Aluminum dish from Pyrex or Calphalon for even heat distribution and easy release.

These materials handle the 350°F oven temperature without warping and make cleanup a breeze. 🔥

Mixing Bowls

Invest in two medium-sized mixing bowls (one for the tuna mixture, one for the egg-cheese blend) to keep ingredients organized. I prefer stainless steel bowls from OXO Good Grips because they’re durable and easy to clean.

A whisk (like the OXO Good Grips Silicone Whisk) helps create a smooth egg mixture without lumps. For the tuna, use a spatula to gently fold in ingredients to preserve flake texture.

Measuring Tools

Precision matters when balancing the 2 cups shredded cheese and 8 eggs. A stainless steel measuring cup set (like Farberware) ensures accuracy, while a microplane (for lemon zest) and garlic press (for 3 cloves) save time.

For the panko breadcrumbs, a 1/4 cup measuring cup with a straight edge prevents overfilling. A kitchen scale is optional but helpful for consistent results if you’re scaling the recipe.

Cheese Tools

Shredding 2 cups cheddar efficiently requires a box grater or mandoline with a cheese blade. I love the Microplane Box Grater for quick, even shreds. For extra convenience, pre-shredded cheese works in a pinch—just drain excess anti-caking agents.

A small bowl for mixing the panko breadcrumbs with 0.25 cup flour keeps the topping dry and crispy.

Oven Thermometer

Ovens run hot or cold, and baking at 350°F is critical for creamy eggs and melted cheese. An oven thermometer (like Thermoworks Oven Thermometer) ensures accuracy. Place it in the oven while preheating—if it reads 360°F, reduce your oven temp by 10°F to compensate.

This small step prevents dry or undercooked casseroles. 💡

Optional Upgrades

For a crispier topping, toast the panko breadcrumbs in a dry skillet over medium heat for 2-3 minutes before mixing with flour. A pastry brush helps spread melted butter evenly on the baking dish.

If you’re meal prepping, glass storage containers (like Rubbermaid) keep leftovers fresh for 4-5 days in the fridge. For freezing, use heavy-duty aluminum foil to seal the dish tightly.

Frequently asked questions