Step 1

For the doughnut holes:Combine the milk, sugar, and yeast in a large bowl. Allow the mixture to sit for 5 minutes, or until the yeast becomes foamy on top.

Step 3

Add the melted butter, egg, and vanilla. Whisk to combine. Add the flour and cinnamon and stir until the shaggy dough forms

Step 5

Transfer the dough to a lightly floured surface and knead gently until a smooth dough forms--about 2-3 minutes. Place the dough in a lightly oiled bowl and set it in a warm spot to rise until doubled in size--about 2 hours.

Step 7

Once the dough has risen, place it on a lightly floured surface (don’t punch it down) and cut it into 20 small pieces. Shape the dough into balls and place them on a baking sheet to rise for another 45 minutes.

Step 9

Once the dough has risen slightly, place a few doughnut holes in the air fryer and cook at 375Ffor 6-8 minutes, or until they’re golden brown on the outside. Repeat with the remaining doughnut holes

Step 11

For the Cinnamon Sugar:

Step 12

Combine the sugar and cinnamon in a large bowl. If you like a thin coating of cinnamon sugar, roll the hot doughnuts in the cinnamon sugar immediately when they come out of the air fryer. If you like a thick coating of cinnamon sugar, roll the doughnut holes in melted butter before adding them to the cinnamon sugar.