Separate biscuits, and place them on a flat surface.
Cut a hole from center of each biscuit with an apple corer, reserving dough balls.
Pour oil into a Dutch oven; heat to 350°. Fry doughnuts, in batches, 30 seconds on each side or until golden. Repeat procedure with dough balls. Remove with a slotted spoon, and drain on paper towels.
Combine sugar and cinnamon. Roll doughnuts and doughnut holes evenly in sugar mixture, or, if desired, dip in Chocolate Glaze.