Heat oil in pan, or fryer if you have one, to 375°F or when you dip a wooden handle in oil, it bubbles

Mix sugar and cinnamon

Use a small cookie cutter, bottle cap, or a very sharp knife to make holes in the center of the bisquits

Drop no more than 4 donuts at a time so they don't stick together

Flip the donuts when they are golden brown on bottom, about a minute or two, and do the same with the top side

Drain grease on paper towels and dip donuts in cinnamon sugar mixture