Tuna Casserole - cooking recipe

Ingredients

1/2 c. chopped onion
2 Tbsp. butter
1 can mushroom soup
1/2 c. chopped tomatoes
2 c. cooked noodles (4 c. raw)
1 c. peas, cooked
1 (7 oz.) tuna

Preparation

Combine all ingredients.
Bake at 400\u00b0 for 20 minutes.
Put sliced cheese on top and croutons.
Broil for 5 minutes.