Whisk together all-purpose flour, granulated sugar, fresh baking powder, and cinnamon in one bowl until combined.
2 cups all-purpose flour, ⅓ cup granulated sugar, 1 tablespoon baking powder, 1 teaspoon cinnamon
In a separate bowl, whisk milk (room temperature), eggs, melted and cooled unsalted butter, and vanilla extract until smooth.
¾ cup milk, 2 large eggs, 3 tablespoons unsalted butter, 1 teaspoon vanilla extract
Pour wet ingredients into dry ingredients and stir gently just until dough forms. Stop mixing as soon as no dry flour remains to avoid tough donuts.
Let the dough rest for 5 minutes. Dust a surface lightly with flour and roll dough to ½-inch thickness. Use a donut cutter or two round cutters (3-inch and 1-inch) to cut out donut shapes.
2 cups all-purpose flour
Preheat the air fryer to 350°F for 3-5 minutes. Lightly spray the air fryer basket with cooking spray.
as needed cooking spray
Place donuts in the basket spaced 1 inch apart. Spray tops lightly with cooking spray. Air fry for 8-10 minutes total, flipping donuts gently halfway through cooking with a spatula to ensure even browning.
as needed cooking spray
Remove donuts and let cool for 2 minutes before glazing or dusting with powdered sugar while warm but not hot for best glaze adherence.
½ cup powdered sugar