2 (10.5 ounce) cans cream of mushroom soup
1 pound ground beef
4 cups raw rice, cooked
1/2 cup chopped onion
1 (8 ounce) carton sour cream
Preheat oven to 350 degrees.
In skillet, brown beef and onion, drain.
Stir in remaining ingredients.
Spoon into greased 9x13 inch baking dish.
Bake for 45 minutes, or until heated through.