3 chicken breasts, boned and skinned
1/2 med. onion, chopped
1 tbsp. vegetable oil
1 tbsp. vinegar
3/4 c. brown sugar
3/4 tsp. mustard
1/2 lg. bottle ketchup
1 1/2 tbsp. Worcestershire sauce

Lightly brown chicken breasts in fry pan and place in baking pan. Combine remaining ingredients in pan and cook slowly for half an hour. Pour sauce over chicken and bake in 350 degree oven for 1 1/2 hours.