Creamy Tuna Noodle Casserole

Featured in: Homemade Comforts

This comforting casserole blends tender egg noodles with flaky tuna and a smooth, creamy sauce enriched by butter, milk, and sour cream. Aromatic herbs like thyme and parsley add depth, while thawed peas and optional mushrooms contribute subtle sweetness and earthiness. The dish is crowned with a crispy onion topping that adds irresistible crunch during baking. Simple steps combine cooking noodles, preparing sauce, stirring in filling, then baking until golden and bubbling, resulting in a hearty and flavorful main course perfect for easy weeknight dinners.

Updated on Fri, 21 Nov 2025 08:36:00 GMT
Creamy Tuna Noodle Casserole with a golden crispy onion topping, a classic comfort food meal. Save
Creamy Tuna Noodle Casserole with a golden crispy onion topping, a classic comfort food meal. | oventhyme.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, bringing comfort and smiles to every meal.

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 cup (120 ml) sour cream, 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.
Prepare sauce base:
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.
Make roux:
Sprinkle flour over onions and stir constantly for 1 minute to cook the flour.
Add liquids:
Gradually whisk in milk and broth. Cook whisking until the sauce thickens about 3 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 30 minutes or until the casserole is bubbling and the onions are golden brown.
Rest:
Let rest for 5 minutes before serving.
This warm photo showcases a bubbling Creamy Tuna Noodle Casserole, perfect for a cozy dinner. Save
This warm photo showcases a bubbling Creamy Tuna Noodle Casserole, perfect for a cozy dinner. | oventhyme.com

Sharing this casserole at family dinners has created many warm memories filled with laughter and stories.

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

A close-up view of creamy tuna noodle casserole topped with crunchy fried onions, ready to eat. Save
A close-up view of creamy tuna noodle casserole topped with crunchy fried onions, ready to eat. | oventhyme.com

This creamy tuna noodle casserole is comfort food at its finest ready to enjoy anytime.

Kitchen Guide

What type of noodles work best?

Wide egg noodles hold the creamy sauce well and provide a tender yet sturdy texture ideal for the casserole.

Can I substitute the tuna?

Yes, canned salmon or cooked chicken can be used as alternatives to add different flavors while maintaining the protein content.

How do I achieve a crispy onion topping?

Using store-bought crispy fried onions and baking uncovered helps them become golden and crunchy without getting soggy.

Is it possible to lighten the dish?

Replacing sour cream with Greek yogurt and using reduced-fat cheese lowers fat while keeping creaminess and flavor.

Can I add extra vegetables?

Frozen peas and sliced mushrooms add texture and color; other mild veggies can be included according to taste.

Creamy Tuna Noodle Casserole

Tender noodles blended with tuna, creamy sauce, and crispy golden onions for a satisfying main dish.

Prep duration
20 min
Kitchen time
30 min
Complete duration
50 min
Created by Grace Mitchell


Skill level Easy

Heritage American

Output 6 Portions

Dietary requirements None specified

What you'll need

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

Method

Phase 01

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

Phase 02

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

Phase 03

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

Phase 04

Make roux: Sprinkle flour over the onions and stir constantly for 1 minute to cook the flour.

Phase 05

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

Phase 06

Season sauce: Remove from heat and stir in sour cream, salt, black pepper, thyme, and parsley.

Phase 07

Add filling ingredients: Fold in drained tuna, peas, mushrooms if using, and shredded cheddar cheese until evenly combined.

Phase 08

Combine noodles with sauce: Add cooked noodles and gently fold to incorporate all ingredients thoroughly.

Phase 09

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

Phase 10

Apply topping: Sprinkle the crispy fried onions evenly over the top.

Phase 11

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

Phase 12

Rest before serving: Allow casserole to rest for 5 minutes before serving.

Kitchen tools needed

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

Allergy notes

Always review ingredients for potential allergens and seek professional medical advice when uncertain.
  • Contains wheat (noodles, flour), dairy (milk, butter, sour cream, cheese), fish (tuna), eggs (egg noodles), and possible soy (crispy onions).
  • Crispy onions may contain gluten or other allergens; verify packaging.

Nutrition breakdown (per portion)

Values shown are estimates only - consult healthcare providers for specific advice.
  • Energy: 410
  • Fats: 16 g
  • Carbohydrates: 43 g
  • Proteins: 25 g