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.
canola or vegetable oil
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.
2 (8 oz) cans refrigerated biscuits
While the donuts are cooling, transfer the jam to a piping bag fitted with a piping tip.
½ cup seedless raspberry jam
Once they have cooled for about 10 minutes, use a butter knife to cut a hole into the side of the donut. Pipe the jam until it starts seeping out of the hole. You will see the doughnut expand as you add the jam.
Lightly dust with powdered sugar through a fine mesh sieve and enjoy immediately.
⅓ cup powdered sugar