Place biscuits on cutting board. With 1 1/4-inch round biscuit cutter, cut hole in center of each.

In bowl, mix sugar and cinnamon. Dip all sides of biscuits and centers into butter; shake off excess butter. Coat with cinnamon-sugar. Place on ungreased large cookie sheet.

Bake at 350°F 14 to 18 minutes or until golden brown.

To reheat, place 1 doughnut at a time on microwavable plate. Microwave uncovered on Medium (50%) 10 to 20 seconds or just until warm.