Best Tuna Casserole

1 (12 ounce) package egg noodles

¼ cup chopped onion

2 cups shredded Cheddar cheese

1 cup frozen green peas

2 (5 ounce) cans tuna, drained

2 (10.75 ounce) cans condensed cream of mushroom soup

½ (4.5 ounce) can sliced mushrooms

1 cup crushed potato chips

Bring a large pot of lightly salted water to a boil. Cook pasta in boiling water for 8 to 10 minutes, or until al dente; drain.

Preheat oven to 425 degrees F (220 degrees C).

In a large bowl, thoroughly mix noodles, onion, 1 cup cheese, peas, tuna, soup and mushrooms. Transfer to a 9x13 inch baking dish, and top with potato chip crumbs and remaining 1 cup cheese.

Bake for 15 to 20 minutes in the preheated oven, or until cheese is bubbly.