Grandma's Baked Beans

1 lb ground chuck
1/2 lb bacon, cut in small pieces
1 medium onion
1 15oz can pork and beans
1 15oz can butter beans
2/3 cup brown sugar
1 tsp yellow mustard
1/4 cup ketchup

Brown bacon and pour off the grease. Set aside. Brown meat and onion then add all remaining ingredients and mix well. Bake at 250 for 2 hours.