My mother has made this for more potluck events than I can count. Anything from scout meetings, to little league events, school benefits, funerals and weddings. Everytime it is served the recipe is requested. I finally put it into the computer for her so that we can just make copies and pass them out. It is one of the easiest dishes around. This recipe also doubles and triples quite well. I've known her to make 40 pounds of chicken with the same results.
Hope it helps.

MESSY CHICKEN

5 lbs broiler-fryer chicken (cut-up)
56 oz ketchup (2 28 oz bottles)
1 pound brown sugar
6 TB worcestershire sauce
4 TB liquid smoke
1/2 cup butter
Garlic powder, salt and pepper to taste
1 onion sliced

Preheat oven to 350 degrees. Combine all ingredients except chicken and onion in a large saucepan and simmer for 20 minutes.

Place some sauce on bottom of roaster. Layer chicken, sliced onion rings and sauce. Repeat this two more times with sauce being on top.

Bake 1/2 hour at 350 degrees then lower oven to 325 degrees and bake 1 1/2 hours to 2 hours longer or until chicken is tender.