Tuna Noodle Casserole Crispy Onions

Featured in: Weekend Comfort Plates

This creamy baked dish combines tender egg noodles with savory tuna and sweet peas, all enveloped in a rich sauce made from cream of mushroom soup, milk, sour cream, and cheddar cheese. Sautéed onion, garlic, and optional mushrooms add depth, while a buttery breadcrumb and crispy fried onion topping provide a golden, crunchy finish. Baked until bubbling and golden, it’s an easy, comforting choice ideal for weeknight dinners or potlucks. Substitute proteins or add fresh herbs to customize flavor.

Updated on Thu, 20 Nov 2025 13:40:00 GMT
Golden-brown tuna noodle casserole boasting a crispy onion topping, perfect for sharing at dinner. Pin it
Golden-brown tuna noodle casserole boasting a crispy onion topping, perfect for sharing at dinner. | fungeniusrecipe.com

A comforting, creamy baked casserole featuring tender noodles, savory tuna, and a golden, crispy onion topping—perfect for family dinners or potlucks.

I first tried this casserole at a neighborhood potluck, and now it's my go-to comfort dish whenever we need something warm and filling. The crispy onions on top always get rave reviews.

Ingredients

  • Pasta: 340 g (12 oz) wide egg noodles
  • Protein: 2 cans (each 170 g/6 oz) tuna in water, drained
  • Vegetables: 1 cup frozen peas, 1 small onion (finely chopped), 2 cloves garlic (minced), 1 cup sliced mushrooms (optional), 2 tbsp chopped fresh parsley
  • Sauce: 1 can (295 g/10.5 oz) condensed cream of mushroom soup, 1 cup whole milk, 1/2 cup sour cream, 1 cup shredded cheddar cheese, 1/2 tsp black pepper, 1/2 tsp salt, 1/2 tsp dried thyme (optional)
  • Topping: 1 1/2 cups crispy fried onions (store-bought), 1/2 cup breadcrumbs, 2 tbsp melted butter

Instructions

Prepare the Baking Dish:
Preheat oven to 190°C (375°F). Lightly grease a 23x33 cm (9x13 inch) baking dish.
Cook Noodles:
Boil egg noodles in a large pot of salted water until al dente. Drain and set aside.
Sauté Vegetables:
Sauté chopped onion and garlic in a skillet over medium heat until soft (about 3 minutes). Add mushrooms if desired and continue cooking until tender.
Make the Sauce:
In a mixing bowl, whisk together condensed soup, milk, sour cream, shredded cheese, salt, pepper, and thyme.
Combine Ingredients:
Gently stir in cooked noodles, drained tuna, peas, sautéed vegetables, and parsley.
Assemble & Top:
Spread mixture in prepared baking dish. Mix breadcrumbs with melted butter and sprinkle over casserole, then top with crispy onions.
Bake:
Bake uncovered 25-30 minutes, until bubbling and topping is golden brown.
Rest:
Let stand 5 minutes before serving.
A bubbling baked tuna noodle casserole, the creamy base visible beneath the crunchy topping. Pin it
A bubbling baked tuna noodle casserole, the creamy base visible beneath the crunchy topping. | fungeniusrecipe.com

This casserole always brings back memories of cozy family nights when everyone gathered around the table for second helpings. Even the kids dig into the crunchy topping!

Required Tools

Large pot, skillet, mixing bowls, whisk, 23x33 cm (9x13 inch) baking dish, measuring cups, and spoons are all you need to make this hearty meal.

Allergen Information

This dish contains wheat, milk, fish, and possibly soy. Always double-check labels if you have sensitivities or allergies.

Nutritional Information

Per serving: 430 calories, 18 g fat, 43 g carbohydrates, and 25 g protein for a balanced dinner option.

Close-up of a warm tuna noodle casserole, showcasing a hearty combination of flavors and textures. Pin it
Close-up of a warm tuna noodle casserole, showcasing a hearty combination of flavors and textures. | fungeniusrecipe.com

Serve this casserole right from the oven with a side salad for a comforting meal everyone will love.

Recipe FAQs

What type of noodles work best for this dish?

Wide egg noodles are ideal as they hold the creamy sauce well and provide a tender bite.

Can I use fresh onions instead of fried onions for the topping?

Fresh onions can be sautéed for added flavor, but crispy fried onions give a distinctive crunchy texture that complements the bake.

Is it possible to add different vegetables?

Yes, mushrooms and peas work well, and you can also include other vegetables like bell peppers or spinach for extra nutrients.

How can I make the dish more flavorful?

Adding a splash of hot sauce or a bit of lemon juice to the sauce enhances the depth and brightness of flavors.

What protein alternatives can be used?

Substitute tuna with canned salmon or cooked shredded chicken to vary the protein while keeping a similar texture.

How should leftovers be stored?

Store leftovers in an airtight container in the refrigerator and consume within 2-3 days for best freshness.

Tuna Noodle Casserole Crispy Onions

Creamy baked noodles with tuna and golden crispy onion topping for a comforting family meal.

Prep time
20 minutes
Cook time
35 minutes
Complete time
55 minutes
Created by Fungeniusrecipe Chloe Anderson

Recipe category Weekend Comfort Plates

Skill level Easy

Cuisine type American

Portions 6 Number of servings

Dietary details None specified

What You Need

Pasta

01 12 oz wide egg noodles

Protein

01 2 cans (6 oz each) tuna in water, drained

Vegetables

01 1 cup frozen peas
02 1 small onion, finely chopped
03 2 cloves garlic, minced
04 1 cup sliced mushrooms (optional)
05 2 tbsp chopped fresh parsley

Sauce

01 1 can (10.5 oz) condensed cream of mushroom soup
02 1 cup whole milk
03 1/2 cup sour cream
04 1 cup shredded cheddar cheese
05 1/2 tsp black pepper
06 1/2 tsp salt
07 1/2 tsp dried thyme (optional)

Topping

01 1 1/2 cups crispy fried onions (store-bought)
02 1/2 cup breadcrumbs
03 2 tbsp melted butter

How to Make

Step 01

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

Step 02

Cook noodles: Boil egg noodles in salted water until al dente. Drain and set aside.

Step 03

Sauté vegetables: In a skillet over medium heat, sauté onion and garlic in oil until soft, about 3 minutes. Add mushrooms if using and cook until tender.

Step 04

Combine sauce ingredients: In a large bowl, whisk together condensed soup, milk, sour cream, cheddar cheese, salt, pepper, and thyme.

Step 05

Mix casserole filling: Add cooked noodles, drained tuna, peas, sautéed vegetables, and parsley to the sauce. Stir gently to combine.

Step 06

Assemble casserole: Pour mixture into prepared baking dish and spread evenly.

Step 07

Prepare topping: Toss breadcrumbs with melted butter. Sprinkle evenly over casserole, then top with crispy fried onions.

Step 08

Bake: Bake uncovered for 25-30 minutes until bubbling and topping is golden brown.

Step 09

Rest before serving: Allow to stand for 5 minutes before serving.

Equipment needed

  • Large pot
  • Skillet
  • Mixing bowls
  • Whisk
  • 9x13 inch baking dish
  • Measuring cups and spoons

Allergy details

Don’t forget to check each item for allergens. Talk to a healthcare professional if you’re unsure.
  • Contains wheat, milk, fish, and possibly soy. Verify labels for allergens and cross-contamination.

Nutrition (each serving)

These nutrition facts are for reference only. Always consult an expert for medical advice.
  • Calorie count: 430
  • Fat content: 18 g
  • Carbohydrates: 43 g
  • Protein content: 25 g