Heat oven to 350°F. Lightly spray cookie sheet with cooking spray.
Cut loaf of dough crosswise into 4 pieces to make buns. Place dough pieces seam sides down and 2 inches apart on cookie sheet. With hands, stretch each dough piece until 4 inches long. With sharp knife, cut 2 diagonal slashes, 1/2 inch deep, on top of each.
Bake 21 to 24 minutes or until golden brown. Cool 2 minutes.
Meanwhile, in 2-quart saucepan, heat barbecue sauce and meatballs over medium-low heat 6 to 8 minutes, stirring occasionally, until hot.
With serrated knife, cut buns in half horizontally, cutting to but not completely through one long side. Spoon 4 meatballs with sauce into each bun.