1 can pork and beans
1 small onion, thinly sliced
1/4 cup sour cream
1/2 onion, chopped
1 1/2 cups grated cheddar or American cheese

Combine all ingredients except 1/2 cup cheese. Pour into a buttered casserole; sprinkle remaining cheese on top.

Bake at 350°F until cheese is melted and bubbly (about 35 minutes).