BAKED HAMBURGER PIE

1 1/2 lbs. hamburger
1 pkg. frozen green peas
1 med. onion
5 med. potatoes
2 cans tomato soup

Spray casserole dish with Pam. Brown hamburger in skillet and drain. Slice onion and potatoes thin. Place hamburger in casserole, add sliced potatoes and onion. Top with green peas. Cover with the tomato soup (undiluted) and bake for 45 minutes or until done at 325 degrees.