Place chicken patties in a large resealable plastic bag; add hot sauce. Seal bag and turn to coat. In a large skillet, brown patties in oil over medium heat for 1-2 minutes on each side or until heated through. Remove and keep warm.
Spread butter over cut sides of buns. In the same skillet, toast buns, buttered side down, over medium heat for 1-2 minutes or until lightly browned. Top with a chicken patty, provolone cheese, salad dressing, lettuce, tomato and onion. Serve with additional hot sauce.