Preheat the oven to 350 degrees F.
In a mixing bowl, combine the chicken, onions, garlic, celery, bell peppers, and parsley. Mix thoroughly. Add the egg, salt, black pepper, cayenne, Worcestershire sauce, hot pepper, and bread crumbs. Using your hands, mix well. Mold the mixture into a 5 by 10 loaf and place on baking sheet lined with aluminum foil. Bake for 1 hour or until juices run clear.
Remove from the oven and let stand for 10 minutes before slicing. Slice the loaf into 1/2 inch pieces. Assemble an open-faced sandwich, using the bread, sliced chicken, mash potatoes and gravy.