2 1/2 lbs. ground beef
1/2 c. chopped onion
3/4 can cream of mushroom soup
Cheese slices
1 pie crust

Mix ingredients together and pat into 9 x 13 inch pan. Then add 1 layer of cheese slices over hamburger mixture. Then cover with your favorite pie crust. Bake at 325 degrees for 1 hour.