Pizza casserole

2 1/2 pounds hamburger
1 small onion
1/2 cup spaghetti noodles
1 pint pizza sauce
1 cup sour cream
3 1/2 tablespoons salad dressing
3 cups grated cheese
Biscuit dough of your choice

Fry hamburger with onion. Cook spaghetti. Put hamburger in casserole dish; add pizza sauce and spaghetti. Mix sour cream, salad dressing and grated cheese and add to casserole dish. Top with your favorite biscuit dough. Bake until lightly brown.