Grease 12 large muffin cups, 3x1 1/2 inches. Divide dough into 16 equal pieces. Shape each piece into a ball, using floured hands. Cut 4 balls into 3 pieces each; roll into small balls. Place 12 large balls in muffin cups. Make indentation in center of each large ball with thumb. Place 1 small ball in each indentation. Cover and refrigerate 2 hours.