• Preheat your air fryer to 375°F.
• In a large mixing bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
• Add the cubed butter and stir. Using a pastry blender, cut the butter into the flour mixture until it resembles small broken-up peas. Add the buttermilk and stir until evenly distributed throughout the batter. Very gently, knead the dough, just until it comes together in a ball.
• Transfer to a lightly floured work surface and pat into a rectangle. Fold the sides of the dough over and onto itself, just as if you were folding a piece of paper to place in an envelope. Dust with flour if needed and roll out until the dough is about a ¼" thick.
• Use a 2 ½-3" round cookie or biscuit cutter, cut out as many circles as you can, and set aside. Bring the dough scraps back together once more and repeat. For donut holes, use a ¾-1" round cutter to cut holes from the center of the dough rounds. Roll the holes into little balls and set aside.
• Place the donuts in the air fryer in a single in your air fryer and cook for 4-5 minutes. You will likely need to cook the donuts in 4 separate batches. Add the donut holes to the air fryer and cook for 3-4 minutes, shaking the basket about halfway through the cook time.

TO MAKE VANILLA GLAZED DONUTS

• Set a rack on top of a work surface lined with wax or parchment paper.
• Combine the powdered sugar, milk, and vanilla in a shallow bowl and stir until smooth.
• Dip both sides of the donut in the glaze and transfer to the rack and allow to set, about 10-15 minutes.

TO MAKE CINNAMON-SUGAR DONUTS

• Add the melted butter to one shallow bowl and in another, combine the granulated sugar, cinnamon, and salt.
• Submerge the donut in the butter, allowing any excess to drip off, then coat thoroughly in the cinnamon-sugar mixture.