Using a plastic bottle cap, cut the center out of each biscuit. Drop dough into hot oil, watching carefully and turning when golden. Once doughnuts are golden on both sides, remove them to a paper towel-lined plate with a slotted spoon. Repeat until all dough is cooked, including doughnut holes.
1 large can Grands biscuits
Dip both sides of each doughnut into melted butter, then press both sides into the cinnamon sugar mixture. Serve warm.