Easy Tuna Noodle Casserole (One Pot!)

This easy tuna noodle casserole is the kind of rich, creamy comfort you crave, combining soft egg noodles, flaked tuna, sweet peas, and a from-scratch cream sauce, all finished beneath a crisp, golden crust. Active prep takes roughly 20 minutes, and everything comes from pantry staples you most likely already have.

How I Improved the Classic Casserole

Tuna noodle casserole is my absolute favorite comfort meal, and I’ve been preparing it for years now. More recently, though, I’ve ditched the can of condensed soup in favor of my homemade cream of anything soup mix, which lets me dial in the salt and seasoning exactly the way I want. And I really prefer it this way a LOT more … the flavor is genuinely better than what you get from cans. That said, you’re welcome to grab a can if that’s easier, and I’ll walk you through both methods. I always say use whatever you’ve got on hand!

I adore this casserole so much that today I’m preparing a double batch: one to serve for dinner tonight and a second to stash in the freezer. That means we eat well this evening, and we’ll also have a warm, ready-to-bake meal waiting when autumn rolls around and our big holiday gathering (Merry Maker Mingle) has us running nonstop.

Let’s dig in!

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What You’ll Need To Make This

Nothing extravagant here, and the majority of these items live in the pantry or freezer, so it’s super simple. Here’s what each ingredient does and where you can swap things.

• Wide egg noodles (12 oz). Those ruffled edges hold the sauce beautifully. We’ll boil them just a touch under “al dente” so they don’t go soft and mushy once they hit the oven.
• Canned tuna (two 5 oz cans), drained. I use the water-packed variety to keep things from getting greasy. Break it into flakes so you avoid dense, heavy chunks. Tuna packets work perfectly well here too if you’d rather use those.
• The creamy sauce. Whisk up my cream of anything soup mix, or open two 10.5-oz cans of cream of mushroom or cream of chicken soup. Either way gives you that luscious, velvety foundation.
• Frozen peas (1 cup). Use them straight out of the freezer. You can swap in corn or chopped broccoli with great results as well.
• Onion and celery. I soften these in butter until tender, because they lend a savory depth that keeps the casserole from tasting like plain noodles swimming about in soup.
• Sharp cheddar. Stirred into the sauce until melted for extra richness, and it also helps bind everything together. Mild cheddar works just fine if that’s what you have.
• A crispy topping. Buttered panko, crushed potato chips, or Ritz crackers all deliver beautifully. For me, that crackly crunch against the creamy noodles is hands-down the best part!

How to Make Tuna Noodle Casserole

This comes together in two stages: build the creamy base on the stovetop, then fold everything in and pop it into the oven. I promise it’s simpler than it sounds.

Step 1: Boil the noodles just shy of done

Cook the noodles one to two minutes under the package directions, then drain and set aside. They continue cooking in the oven, so pulling them early is what keeps them tender rather than mushy. Avoid boiling them all the way through… they’ll disintegrate later.

Step 2: Build the creamy sauce in the same pot

Right in the SAME pot you used for the noodles, melt the butter and cook the onion and celery until softened, 4 to 5 minutes.

If you’re using my soup mix, whisk it into the milk, pour it in, and stir over medium heat until thickened, about 3 to 4 minutes. For canned soup, simply stir it in with a splash of milk and warm through. Remove from heat and fold in the cheddar until melted and smooth. Avoid a hard boil once the cheese is in, or the sauce can go grainy.

Step 3: Fold together, top, and bake

Return the noodles, tuna, and peas to the pot and fold gently. Taste and adjust salt and pepper at the end (both tuna and soup bring their own salt, so season last).

Transfer to a buttered 9×13 dish, scatter the topping over, and bake at 375°F for 25 to 30 minutes, until bubbling and golden. Let it rest 5 minutes before serving. It’ll be SO GOOD.

Can I Make It Ahead?

Totally! Assemble without the topping, cover, and refrigerate for up to a day. Add the topping before baking and tack on an extra 10 minutes since it’s starting cold. If the sauce seems thick, loosen it with a splash of milk first.

How to Store and Reheat

Leftovers last 3 to 4 days in the fridge. Warm with a spoonful of milk to bring the sauce back to life, since it firms up as it cools.

Freezing Ahead

This casserole freezes best unbaked. The key is to undercook the noodles a bit more, pulling them 2 to 3 minutes early, because they’ll soften again during thawing and baking. Assemble everything minus the crispy topping, seal tightly, and freeze for up to 3 months. When you’re ready to use it, thaw overnight in the fridge, add a fresh topping, and bake with an extra 10 to 15 minutes since it’s cold.

You can also bake straight from frozen (which is what I do, because I never remember to thaw it overnight). Just cover with foil for 60 to 75 minutes, uncovering the last 15 to crisp the top. If the sauce looks slightly grainy after thawing, don’t worry … a gentle stir and the oven will smooth it right out.

Frequently Asked Questions

Why is my casserole dry?

Typically the noodles overcooked and soaked up all the sauce, or it stayed in the oven a bit too long. Pull the noodles early, check doneness at 25 minutes, and stir a little broth or milk into the sauce if you prefer it extra creamy.

Can I make this without cheese?

Yes, it holds together just fine. You may simply want to season the sauce a touch more.

Can I make this with less salt?

Yes, and the easiest way is by altering the soup base. Use a low-sodium bouillon powder (or a little less of it) in your cream of anything soup mix, or opt for a low-sodium cream soup, and you’ve cut most of the sodium right there. From there, choose no-salt-added or low-sodium tuna, use unsalted butter, and go with panko for the topping. Then lean on that “season last” step I mentioned by tasting before adding any extra salt, because between the tuna, the mix, and the cheese, there’s usually plenty. This is precisely why I love building the soup base from scratch… you decide how much salt goes in, not the can.

And that’s all there is to it! Nice and easy. Please let me know what you think of it if you cook this casserole.

Love,
Jennifer

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