Pork & Bean Casserole

1 large can Pork and Beans or 2 small cans
1 pound ground beef
1/2 cup diced onion
grated cheese

Heat oven to 375. Brown beef and onion. In casserole dish place in layers: half of meat, half of beans and cheese, then the other half the meat, beans and cheese. Bake for 20 minutes.