This Instant Pot tuna noodle casserole is dinner in one pot. It is fast, creamy, and made without any canned soup. The pasta cooks right in the broth, so there is no colander to wash and no separate pot of boiling water. From the time you open the cans to the time you sit down is about 25 minutes.

It is the kind of meal I lean on when the fridge is getting bare. You need elbow macaroni, a couple cans of tuna, chicken broth, milk, cheddar, and a few basic seasonings. No weird ingredients, no complicated steps. Frozen peas are optional, but they add a pop of color and a little sweetness that works well with the tuna.

Why This Instant Pot Tuna Noodle Casserole Works

The trick is cooking the pasta in just enough liquid. Three cups of broth to 12 ounces of macaroni is the right amount for a 3-minute pressure cook. The pasta soaks up most of the broth as it cooks, and the starch it releases stays in the pot. That starch is what helps the milk and cheese turn into a smooth sauce later, the same way pasta water thickens a sauce on the stovetop.

Everything that could overcook goes in at the end. Tuna is already cooked, so it only needs to warm through. Frozen peas thaw in a minute or two in the hot pasta. The cheese goes in last and melts from the heat of the pot. Letting it sit for 5 minutes gives the sauce time to thicken so it clings to every piece of macaroni instead of pooling at the bottom.

Ingredients and Easy Swaps

Elbow macaroni. This version uses elbows because they cook evenly under pressure and hold the sauce well. If you want the classic egg noodle texture, wide egg noodles work too. Use the same weight and keep the cook time at 3 minutes.

Tuna. Two 5-ounce cans, drained and flaked. Tuna packed in water keeps the dish lighter. Tuna packed in oil has a richer flavor; just drain it well. Canned salmon or a cup of shredded cooked chicken also work.

Chicken broth. Broth gives the pasta much more flavor than water would. Vegetable broth is a good swap. If you use regular broth instead of low-sodium, taste before adding all the salt.

Milk or half-and-half. Whole milk makes a creamy sauce. Half-and-half makes it richer. Skim milk works, but the sauce will be thinner.

Cheddar cheese. Shred it yourself from a block if you can. Bagged shredded cheese has a coating that keeps it from clumping in the bag, and it can make the sauce a little grainy. Colby jack or a mix of cheddar and mozzarella are good swaps.

How to Make It at a Glance

1. Add the macaroni, broth, butter, garlic powder, onion powder, salt, and pepper to the Instant Pot and stir.
2. Lock the lid and cook on high pressure for 3 minutes.
3. Quick release the pressure and open the lid.
4. Stir in the tuna, peas, and milk until warmed through.
5. Stir in the cheddar until melted, then let it sit 5 minutes to thicken.

Common Mistakes to Avoid

Not stirring before sealing. Push all the pasta down under the broth and give it a good stir. Pasta that sits on top stays hard, and pasta stuck to the bottom can trigger the burn warning.

Using natural release. Quick release right away. If the pot sits and releases on its own, the pasta keeps cooking and turns mushy.

Adding the cheese on high heat. Turn off the Instant Pot or switch it to Keep Warm before adding the cheese. Too much heat can make the cheese oily and stringy instead of smooth.

Serving it right away. The sauce looks thin at first. Give it the full 5 minutes. It thickens a lot as it sits.

Variations

Crunchy topping. Spoon the finished casserole into a baking dish, top with buttered breadcrumbs or crushed potato chips, and broil for 2 to 3 minutes until golden. Watch it closely so it does not burn.

Add mushrooms. Use the Sauté setting to cook 8 ounces of sliced mushrooms in the butter for about 5 minutes before adding the pasta and broth. Then continue as written.

Lemon and dill. Stir in the juice of half a lemon and a teaspoon of dried dill with the tuna for a brighter flavor.

What to Serve With It

Tuna noodle casserole is filling on its own, so a light side is all you need. A green salad with a simple vinaigrette cuts through the creamy sauce. Steamed broccoli, roasted green beans, or a plate of sliced cucumbers and tomatoes also work. If you skip the peas in the casserole, a vegetable side becomes more important.

Make Ahead, Storage, and Reheating

Storage. Let leftovers cool, then store them in an airtight container in the fridge for up to 3 days. The pasta keeps soaking up sauce, so it will be thicker the next day.

Freezing. You can freeze it for up to 2 months, but the pasta will be softer after thawing. Thaw overnight in the fridge before reheating.

Reheating. Add a splash of milk or broth to bring the sauce back. Microwave covered in 1-minute bursts, stirring in between, until hot. On the stove, warm it over low heat and stir often so the cheese does not stick.

Frequently Asked Questions

Can I double this recipe?
Yes, in a 6-quart or larger Instant Pot. Double all the ingredients and keep the cook time at 3 minutes. The pot will take longer to come up to pressure.

Why did I get a burn warning?
Usually it means pasta was stuck to the bottom. Stir well before sealing and make sure all the pasta is covered by broth.

Can I make it without an Instant Pot?
Yes. Simmer the macaroni in the broth and seasonings in a covered pot, stirring often, for about 8 to 10 minutes until tender. Then stir in the rest as written.