Heat around 3 inches of oil in a large, deep pan over medium-high heat (oil should be 350 F.). To see if the oil is hot enough, use a thermometer or place wooden skewer into the oil. If small bubbles appear, it’s ready for frying.
Remove biscuits from the can. To make small doughnuts, cut into rounds using a soda cap or other small circular device. Or you can fry the biscuits as is.
Drop the small doughnuts in 5-6 at a time; for full biscuits, 2-3 at a time. Fry for 1-2 minutes on each side, until just golden brown.
Using a spider or slotted spoon, remove from oil and place on a wire rack. Allow to cool completely.
Stick a wooden skewer into one side of each doughnut and create space inside by wiggling it around gently.
Fill a piping bag with your filling of choice and gently insert into the hole. Gently squeeze filling into each doughnut.
Dust with powdered sugar.