Classic Tuna Noodle Casserole

Tuna casserole is one of those dishes that every American kitchen has made at least once, and the ones people remember never came from a can of condensed soup. This version builds the sauce from scratch with real mushrooms, butter, and milk — and it takes about the same time as opening two cans.

Wide egg noodles, flaked albacore tuna, peas, and a creamy mushroom-cheddar sauce bake under a layer of buttery panko until the top goes crisp and the edges bubble. It is unapologetically old-fashioned comfort food, just without the metallic aftertaste of canned cream-of-anything.

We tested this alongside the condensed soup version side by side and the difference was obvious from the first bite. The from-scratch sauce has a cleaner flavor and the mushrooms actually taste like mushrooms.

Why This Recipe Works

• A from-scratch sauce replaces canned soup entirely. Real mushrooms, butter, flour, and milk give you a sauce that is richer, cleaner, and free of the tinny aftertaste. It takes about 10 minutes.
• Panko breadcrumbs on top stay crunchy. Tossed with melted butter before baking, they turn golden and crisp in the oven. Regular breadcrumbs tend to absorb moisture and go soft.
• Peas go in with the noodles at the end. Adding them to the boiling pasta water for the last 30 seconds cooks them just enough. They stay bright green and slightly firm instead of turning army green.

Ingredient Notes

• Tuna: Solid white albacore packed in water has the meatiest texture and mildest flavor. Drain it well and break it into chunks, not fine shreds — you want to bite into a piece of fish, not wonder where it went.
• Egg noodles: Wide egg noodles are traditional and hold the sauce in their curves and folds. Penne or rotini work but change the character. Cook them one minute short — they finish in the oven.
• Mushrooms: Cremini (baby bella) mushrooms have more flavor than white button mushrooms. Slice them about 1/4-inch thick. They shrink significantly while cooking, so the 8 ounces will cook down to much less.
• Cheddar cheese: Sharp cheddar adds flavor, not just meltiness. Mild cheddar works but the casserole will taste flatter.

How to Make Tuna Noodle Casserole

1. Cook the noodles and peas. Boil the egg noodles one minute short of done, adding peas in the last 30 seconds. Drain well — excess water thins the sauce.

2. Build the sauce. Sauté onion, celery, mushrooms, and garlic in butter. Sprinkle flour over the vegetables, stir for a minute, then slowly whisk in milk and broth. The sauce thickens in about 4-5 minutes. Remove from heat and stir in the cheese until it melts.

3. Combine and transfer. Fold the tuna and noodle-pea mixture into the sauce. Spread it into the baking dish and top with the remaining cheddar and buttered panko.

4. Bake until golden. 25-30 minutes at 375°F gives you bubbly edges and a golden breadcrumb top. Let it rest 5 minutes so the sauce sets enough to hold a scoop.

Pro Tips

• Drain the tuna thoroughly. Press it in the can with the lid to squeeze out as much liquid as possible. Wet tuna dilutes the sauce.
• Do not skip cooking the flour. Stirring the flour over the vegetables for a full minute cooks out the raw starchy taste. Skipping this step gives the finished sauce a pasty, chalky undertone.
• Toss the breadcrumbs with melted butter before scattering. Dry panko on top of a casserole barely browns. The butter is what makes them turn deep golden and shatteringly crisp.
• Let it rest before scooping. The 5-minute rest off the heat lets the sauce thicken up. Cutting into it immediately gives you a puddle on the plate.

Variations

• Extra-crispy top: Mix 2 tablespoons of grated Parmesan into the buttered panko before scattering. The Parmesan crisps up and adds a savory crust.
• Spicy tuna casserole: Stir 1 teaspoon of sriracha or a diced jalapeño into the sauce. Swap the cheddar for pepper jack.
• Broccoli instead of peas: Use 1.5 cups of small broccoli florets. Steam or blanch them for 2 minutes before folding in — raw broccoli will not cook through in the baking time.
• Swap the noodles for rice: Use 3 cups of cooked white rice in place of the egg noodles. The casserole will be denser. Our chicken and rice casserole follows a similar structure.

Storage and Reheating

Refrigerate leftovers in an airtight container for up to 3-4 days (USDA guideline for cooked fish and seafood).

Reheat individual servings in the microwave at 50% power for 2-3 minutes, stirring once halfway through. For the whole dish, cover with foil and bake at 325°F (163°C) for 20-25 minutes until heated through to 165°F (74°C).

Freezes well for up to 2 months. Cool completely, wrap tightly in plastic wrap then foil, and freeze. Thaw overnight in the fridge before reheating. The breadcrumb topping softens after freezing — scatter fresh buttered panko on top and broil for 2 minutes after reheating.

Frequently Asked Questions

Can I use canned cream of mushroom soup instead?

You can, but you lose the clean flavor. One 10.5 oz can of condensed cream of mushroom soup plus 1/2 cup of milk replaces the from-scratch sauce. Skip the mushrooms, flour, and broth in that case.

What kind of tuna should I use?

Solid white albacore in water has the mildest flavor and firmest texture. Chunk light tuna works and costs less, but it has a stronger fishy taste and falls apart more. Avoid tuna packed in oil — it makes the casserole greasy.

Can I make this ahead?

Assemble through the breadcrumb step, cover tightly, and refrigerate for up to 24 hours. Add 10-15 minutes to the bake time since it starts cold. The breadcrumbs may absorb some moisture — if so, scatter a thin extra layer of buttered panko on top before baking.

What to Serve With Tuna Casserole

A simple green salad with a bright vinaigrette cuts through the richness. Roasted green beans or steamed broccoli on the side keep it classic.

For more casserole ideas, try our chicken broccoli casserole for a different protein, or the cheesy hashbrown casserole if you want something on the side of the table.