Line a baking sheet with parchment paper.Put sugar in a shallow bowl; set aside.Remove the biscuits from the can, separate them, and place them on the baking sheet.if you want donut bites, cut each biscuit into four piecesSpray donuts with cooking spray or olive oil from a spritzerPlace biscuits in a single layer in the air fryer (try to keep them from touching – if you have more biscuits than will fit in your air fryer – you’ll have to do two batches)Close the air fryer and set to 350°F. Cook, 3 minutes. Open air fryer, flip biscuits and cook 3 minutes moreWhile biscuits are air frying, melt butter in microwave and pour into a bowlTransfer biscuits to the baking sheet.Toss biscuits in melted butter bowlMove biscuits to sugar bowl and toss to coat heavilyServe warm