Step 1

Preheat over to 375°F. Coat a 9-by-13-inch baking dish with cooking spray. Bring a large pot of water to a boil.

Step 2

Cook noodles in the pot of boiling water according to package instructions. Drain and rinse under cold running water. Transfer to a large bowl.

Step 3

Add mushroom soup, tuna, onion and peas to the noodles; stir until combined. Scrape the mixture into the prepared baking dish. Combine breadcrumbs and cheese in a medium bowl; sprinkle over the casserole.

Step 4

Bake until bubbly and lightly browned, 20 to 25 minutes.