Creamy Tuna Noodle Casserole

Featured in: Comfort Baking

This comforting casserole combines tender egg noodles and flaky tuna in a rich, creamy sauce flavored with garlic, thyme, and parsley. The filling is enhanced with peas, mushrooms, and sharp cheddar cheese, then topped with a golden layer of crispy onions to add irresistible crunch. Baked until bubbling and golden, it offers a satisfying blend of textures and savory flavors that make it an easy and flavorful main dish for any occasion.

Updated on Fri, 21 Nov 2025 14:14:00 GMT
A close-up of creamy tuna noodle casserole with golden, crispy onion topping. Save
A close-up of creamy tuna noodle casserole with golden, crispy onion topping. | butterhearth.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 casserole has been a favorite in my family for years; it's comforting and always a crowd-pleaser.

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.
Cook aromatics:
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.
Add flour:
Sprinkle flour over onions and stir constantly for 1 minute to cook the flour.
Make sauce:
Gradually whisk in milk and broth. Cook whisking until the sauce thickens about 3 to 4 minutes.
Season 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.
Assemble casserole:
Transfer mixture to the prepared baking dish. Spread evenly.
Add topping:
Top with crispy fried onions.
Bake:
Bake uncovered for 25 to 30 minutes or until the casserole is bubbling and the onions are golden brown.
Rest:
Let rest for 5 minutes before serving.
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This dish brings back fond memories of family dinners and cozy weekends at home.

Notes

For a lighter version use Greek yogurt instead of sour cream and reduced-fat cheese. Substitute canned salmon or cooked chicken for tuna if desired. Add a pinch of cayenne pepper or a dash of hot sauce for a kick. Pair with a crisp green salad and a glass of Chardonnay.

Required Tools

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

Nutritional Information

Calories 410; total fat 16 g; carbohydrates 43 g; protein 25 g per serving

Steaming hot creamy tuna noodle casserole with a bubbly, golden crispy onion crust. Save
Steaming hot creamy tuna noodle casserole with a bubbly, golden crispy onion crust. | butterhearth.com

This creamy tuna noodle casserole is perfect for meal prep and freezes well for later enjoyment.

Recipe Questions

Can I substitute the tuna with other proteins?

Yes, canned salmon or cooked chicken can replace the tuna for different flavor variations while maintaining a similar texture.

How do I achieve a crispy topping?

Use store-bought crispy fried onions and add them just before baking to ensure they stay golden and crunchy after cooking.

Can this dish be made lighter?

Yes, replace sour cream with Greek yogurt and use reduced-fat cheese to lower fat content without sacrificing creaminess.

Can I add vegetables to the casserole?

Peas and mushrooms are great additions that complement the flavors well and add extra texture and nutrients.

What herbs enhance the sauce's flavor?

Dried thyme and parsley are used to add subtle herbal notes that balance the richness of the creamy sauce.

Creamy Tuna Noodle Casserole

Tender egg noodles with savory tuna, creamy sauce, and a crunchy onion topping for a warm, comforting dish.

Prep duration
20 min
Time to cook
30 min
Complete duration
50 min
Created by Grace Mitchell


Skill Level Easy

Heritage American

Output 6 Portions

Dietary considerations None specified

Components

Pasta

01 12 ounces 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 ounces 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

Directions

Stage 01

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

Stage 02

Cook Noodles: Bring a large pot of salted water to a boil and cook the egg noodles until al dente according to package instructions. Drain and set aside.

Stage 03

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

Stage 04

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

Stage 05

Add Liquids and Thicken: Gradually whisk in whole milk and broth. Continue whisking and cook until the sauce thickens, about 3 to 4 minutes.

Stage 06

Incorporate Seasonings and Dairy: Remove the skillet from heat and stir in sour cream, salt, ground black pepper, thyme, and parsley.

Stage 07

Combine Filling Ingredients: Fold in drained tuna, thawed peas, sliced mushrooms if using, and shredded cheddar cheese until evenly distributed.

Stage 08

Mix with Noodles: Add the cooked egg noodles and gently fold to combine all ingredients thoroughly.

Stage 09

Assemble in Baking Dish: Transfer the mixture to the prepared baking dish and spread it evenly.

Stage 10

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

Stage 11

Bake: Bake uncovered for 25 to 30 minutes, or until the casserole bubbles and the onion topping is golden brown.

Stage 12

Rest Before Serving: Let the dish rest for 5 minutes before serving to set.

Necessary tools

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

Allergy details

Review each component for potential allergens and consider consulting with a healthcare provider if you're unsure about certain ingredients.
  • Contains wheat, dairy, fish, eggs, and possible soy from crispy onions.

Nutritional information (per portion)

These values are estimates only and shouldn't replace professional medical guidance.
  • Energy Value: 410
  • Fats: 16 g
  • Carbohydrates: 43 g
  • Protein Content: 25 g