Cook bacon till crisp.
Remove bacon, reserving about 3 tablespoons drippings in skillet.
Crumble bacon and set aside.
Cook onion in reserved drippings till tender.
Stir in pork and beans, brown sugar, catsup, Worcestershire, and mustard.
Turn into 11/2-quart casserole.
Bake, uncovered, at 350° for 1 1/2 to 1 3/4 ours.
Stir; top with bacon.
Let stand a few minutes before serving