Open your can of biscuits and separate each biscuit onto a cutting board.
Cut out a 1" donut hole in the center of each biscuit. Set the holes aside to be cooked later.**
Using a pastry brush, brush the tops of the biscuits with melted butter. Flip over and repeat on the other side. This will help make the biscuits brown and taste more pastry like.
Next, preheat your air fryer to 350° for 2-3 minutes.
Once preheated, add your biscuit donuts, in a single layer to the air fryer basket.
Leave a couple of inches between each donut to give them room to rise while frying.
Depending on the size of your fryer, you may need to cook the donuts in 2-3 batches.
Fry the donuts for 6-7 minutes, flipping halfway through. The donuts are done when they've risen significantly and are golden brown.
Making The GlazeWhile your biscuit donuts are baking away in the air fryer, set up your glazing station.
To make the glaze, combine the powdered sugar, vanilla, and 4 tablespoons of milk in a bowl. Make sure to select a bowl that's big enough for dipping donuts.
Whisk the ingredients together until the mixture is combined, smooth, and will easily pour off a spoon. You want the glaze to be about as thick as heavy cream. Add more milk a tablespoon at a time to thin if necessary. Set aside.
Next, set a wire cooling rack over a sheet of parchment paper or a cookie sheet. This is where you'll set the donuts after glazing. The parchment paper will collect any icing drips.
Glaze the donutsOnce the first batch of donuts is done frying, working quickly, dunk the hot donuts one at a time, into the bowl of vanilla glaze.
Use a fork to flip and toss the donut gently in the glaze until completely coated.
Carefully lift the donut out of the bowl and allow excess glaze to drip off. Place the dipped donut on the wire rack to set.
Repeat dipping each donut until they are all coated and on the cooling rack.
Finish The Remaining DonutsAdd your second batch of biscuit dough to the air fryer and fry until cooked through.
Repeat the same glazing process with your second batch of hot donuts.
Depending on the size of your air fryer, you may need to repeat this process a third time.
Air fryer donut holesTo cook your donut holes, toss the biscuit nuggets in the remaining melted butter from the big donuts.
Add the buttered donut holes to the air fryer basket and fry for 3 minutes until puffed and browned. Once fully cooked, coat the donut holes in the remaining vanilla glaze and transfer to the wire rack to set.
Once the glaze has set on your donuts, serve and enjoy!