Add enough oil to the frying pan, dutch oven, or deep fryer so that it is 2 inches deep. If using a deep fryer, set it to 350°F. If using a frying pan or dutch oven, heat the oil on medium-high heat until it reaches temperature. The oil is ready if you flick a little water into it and it boils immediately.
Working in batches, add 5 of the biscuits into the oil and fry for about 4 to 5 mins per side. You don't want to fry more than 5 at a time because it can bring the temperature of the oil down and prevent them from cooking properly. Once browned, remove from the oil with a slotted spoon or spider scoop and place on a wire rack lined with paper towels to cool.
Keep any leftover Jelly Filled Donuts in an airtight container at room temperature. These start to go stale relatively quickly, so I recommend enjoying them within one day.