Prepare the apples by peeling, coring, and dicing them into small pieces.
In a large bowl, combine the dry ingredients: flour, sugar, baking powder, cinnamon, and salt.
In another bowl, whisk together the wet ingredients: milk, egg, vanilla extract, and melted butter.
Pour the wet mixture into the dry ingredients and stir gently until just combined. Fold in the diced apples.
Preheat the air fryer to 350°F and lightly spray the basket with cooking spray.
Drop spoonfuls of the batter into the air fryer basket, leaving space between each fritter.
Air fry for 10-12 minutes, flipping halfway through for even cooking.
Prepare the glaze by whisking together powdered sugar, milk, and vanilla extract until smooth.
Drizzle the glaze over the warm fritters before serving.