2 (16 oz.) cans baked beans
1 (15 oz.) can kidney beans, drained
1 (15 oz.) can pinto beans, drained
1/2 c. brown sugar
1 c. ketchup
1 onion, chopped

Combine all ingredients in a large casserole dish. Mix well. Bake in preheated 250 degree oven for 3 hours. Stir every hour. Serves 8.