BROWN beef and onion; drain. Stir in barbecue sauce and brown sugar; cook 1 minute.
PRESS or roll each biscuit to 5 1/2-inch round. Place 1 biscuit in each of 8 greased regular-size muffin cups (for 12-cup muffin pan, use 8 outside cups for best baking results). Firmly press in bottom and up sides, forming a 1/4-inch rim. Fill with beef mixture; sprinkle with cheese.
BAKE at 350°F 20 to 25 minutes or until golden brown. Cool 1 minute, remove from pan.