Creamy Tuna Noodle Casserole

Featured in: Cozy Pasta Recipes

This classic American casserole brings together wide egg noodles with flaky tuna and a rich sauce made from butter, milk, and sour cream. Aromatic onions and garlic form the base of the creamy sauce, enhanced with herbs like thyme and parsley. Peas and optional mushrooms add texture while shredded cheddar melts throughout. The dish finishes with a crunchy topping of golden fried onions, baked until bubbling and inviting. Perfect for an easy pescatarian main with savory layers and satisfying flavors.

Updated on Fri, 21 Nov 2025 08:09:00 GMT
Golden-brown creamy tuna noodle casserole with crispy onion topping, ready to serve and enjoy. Save
Golden-brown creamy tuna noodle casserole with crispy onion topping, ready to serve and enjoy. | basilhearth.com

A comforting classic casserole featuring tender egg noodles, savory tuna, and a rich creamy sauce, all topped with golden crispy onions for irresistible crunch.

This creamy tuna noodle casserole has been a family favorite for years with its blend of flavors and easy preparation.

Ingredients

  • Pasta: 12 oz (340 g) wide egg noodles
  • Sauce: 2 tablespoons unsalted butter, 1 small yellow onion finely chopped, 2 cloves garlic minced, 3 tablespoons all purpose flour, 2 cups (480 ml) whole milk, 1 cup (240 ml) low sodium chicken or vegetable broth, 1/2 teaspoon salt, 1/2 teaspoon ground black pepper, 1/2 teaspoon dried thyme, 1/2 teaspoon dried parsley
  • Filling: 2 cans (5 oz/140 g each) solid white tuna in water drained and flaked, 1 cup (120 g) frozen peas thawed, 1 cup (100 g) sliced white mushrooms (optional), 1 cup (115 g) shredded cheddar cheese
  • Topping: 1 1/2 cups (75 g) store bought crispy fried onions

Instructions

Preheat oven:
Preheat the oven to 375°F (190°C) Lightly grease a 9x13 inch (23x33 cm) baking dish
Cook noodles:
Bring a large pot of salted water to a boil Cook egg noodles according to package directions until al dente Drain and set aside
Make sauce:
While noodles cook melt butter in a large skillet over medium heat Add chopped onion and cook for 3 minutes until softened Add garlic and cook for 1 minute
Cook flour:
Sprinkle flour over onions and stir constantly for 1 minute to cook the flour
Whisk liquids:
Gradually whisk in milk and broth Cook whisking until the sauce thickens about 3–4 minutes
Finish sauce:
Remove from heat Stir in sour cream salt pepper thyme and parsley
Add filling:
Add drained tuna peas mushrooms (if using) and shredded cheddar cheese to the sauce Stir until evenly combined
Combine noodles:
Add cooked noodles and gently fold until everything is well mixed
Prepare casserole:
Transfer mixture to the prepared baking dish Spread evenly
Add topping:
Top with crispy fried onions
Bake:
Bake uncovered for 25–30 minutes or until the casserole is bubbling and the onions are golden brown
Rest:
Let rest for 5 minutes before serving
A close-up shot of a bubbling creamy tuna noodle casserole with a crispy onion topping. Save
A close-up shot of a bubbling creamy tuna noodle casserole with a crispy onion topping. | basilhearth.com

Our family loves gathering around the table to enjoy this warm and hearty meal together on chilly nights.

Required Tools

Large pot, large skillet, whisk, 9x13 inch baking dish, mixing spoon

Allergen Information

Contains Wheat (noodles flour), Dairy (milk butter sour cream cheese), Fish (tuna), Eggs (egg noodles), Possible soy (crispy onions). Check packaging for allergen details before use.

Nutritional Information

Calories: 410, Total Fat: 16 g, Carbohydrates: 43 g, Protein: 25 g per serving

Warm and comforting creamy tuna noodle casserole, a classic American dish with fresh toppings. Save
Warm and comforting creamy tuna noodle casserole, a classic American dish with fresh toppings. | basilhearth.com

This casserole is best served hot and pairs wonderfully with a crisp green salad or steamed vegetables.

Recipe FAQs

What type of noodles work best?

Wide egg noodles are ideal for their tender texture and ability to hold the creamy sauce well.

Can I use fresh onions instead of fried topping?

Fresh onions are used in the sauce base, but the crispy topping provides a distinct crunch; substituting reduces texture contrast.

Is there a good alternative to sour cream?

Greek yogurt can be used to lighten the sauce and maintain creaminess with a slightly tangy flavor.

How can I add a spicy kick?

A pinch of cayenne pepper or a dash of hot sauce added to the sauce can add subtle heat without overpowering flavors.

Are mushrooms necessary in this dish?

Mushrooms are optional; they add earthiness and texture but can be omitted according to preference.

Creamy Tuna Noodle Casserole

Tender noodles and savory tuna meld with rich sauce and crispy onion topping for a comforting dish.

Prep Time
20 minutes
Time to Cook
30 minutes
Total Duration
50 minutes
Recipe by Laura Bennett

Recipe Type Cozy Pasta Recipes

Skill Level Easy

Cuisine Type American

Makes 6 Portions

Dietary Details None specified

What You'll Need

Pasta

01 12 oz wide egg noodles

Sauce

01 2 tablespoons unsalted butter
02 1 small yellow onion, finely chopped
03 2 cloves garlic, minced
04 3 tablespoons all-purpose flour
05 2 cups whole milk
06 1 cup low-sodium chicken or vegetable broth
07 1/2 cup sour cream
08 1/2 teaspoon salt
09 1/2 teaspoon ground black pepper
10 1/2 teaspoon dried thyme
11 1/2 teaspoon dried parsley

Filling

01 2 cans (5 oz each) solid white tuna in water, drained and flaked
02 1 cup frozen peas, thawed
03 1 cup sliced white mushrooms (optional)
04 1 cup shredded cheddar cheese

Topping

01 1 1/2 cups store-bought crispy fried onions

How To Make It

Step 01

Prepare Oven and Dish: Preheat the oven to 375°F. Lightly grease a 9x13-inch baking dish.

Step 02

Cook Noodles: Bring a large pot of salted water to a boil. Cook egg noodles until al dente, then drain and set aside.

Step 03

Sauté Aromatics: Melt butter in a large skillet over medium heat. Add onion and cook for 3 minutes until softened. Stir in garlic and cook for 1 minute.

Step 04

Make Roux: Sprinkle flour over onion mixture and stir constantly for 1 minute to cook the flour.

Step 05

Prepare Sauce: Gradually whisk in milk and broth. Continue whisking until the sauce thickens, about 3 to 4 minutes.

Step 06

Combine Sauce Ingredients: Remove from heat. Stir in sour cream, salt, pepper, thyme, and parsley until smooth.

Step 07

Add Filling: Incorporate drained tuna, peas, mushrooms if using, and shredded cheddar cheese into the sauce. Stir to combine evenly.

Step 08

Mix with Noodles: Gently fold the cooked noodles into the filling mixture until evenly combined.

Step 09

Assemble Casserole: Transfer the mixture to the prepared baking dish and spread it evenly.

Step 10

Add Topping: Sprinkle crispy fried onions evenly over the top.

Step 11

Bake: Bake uncovered for 25 to 30 minutes until bubbling and the onions turn golden brown.

Step 12

Rest Before Serving: Let rest for 5 minutes before portioning and serving.

Tools Needed

  • Large pot
  • Large skillet
  • Whisk
  • 9x13-inch baking dish
  • Mixing spoon

Allergy Warnings

Review every ingredient for allergens and reach out to a medical expert if you're uncertain.
  • Contains wheat, dairy, fish, and eggs.
  • Crispy onions may contain gluten or soy; verify packaging.

Nutrition information (serving size)

These nutritional details are for reference. They're not meant as medical guidance.
  • Caloric Value: 410
  • Fat content: 16 grams
  • Carbohydrates: 43 grams
  • Protein Amount: 25 grams