👩🍳 Instructions
1
Whisk together flour, protein powder (if using), sugar, baking powder, baking soda, and salt in a bowl.
2
In another bowl, beat the egg and mix in Greek yogurt and vanilla (add 1 tbsp milk if yogurt is very thick).
3
Fold the wet ingredients into the dry until just combined into a thick, slightly sticky batter.
4
Scoop 1-inch balls of batter and place on a tray lined with parchment.
5
Preheat your air fryer to 350°F (175°C). Lightly spray the basket or use a silicone liner.
6
Arrange the donut holes in a single layer and air-fry for 6–8 minutes, flipping halfway, until golden and springy.
7
Brush warm donut holes with melted butter or oil and toss in a mixture of sugar and cinnamon.
8
Cool 2–3 minutes before serving. Reheat in air fryer at 320°F for 3–4 minutes if needed.
