In a medium bowl, combine the diced apples, brown sugar, cinnamon, and vanilla extract. Toss until the apples are evenly coated.

Place the apple mixture in a small saucepan over medium heat. Cook for 5-7 minutes until the apples are slightly softened. Remove from heat and let cool slightly.

Lay out the tortillas and place a spoonful of the apple mixture in the center of each. Roll the tortillas tightly into taquito shapes and secure with a toothpick if necessary.

Brush the outside of each taquito lightly with the melted butter.

Place the taquitos in the air fryer basket in a single layer. Air fry at 375°F (190°C) for 6-8 minutes, flipping halfway through, until golden brown and crispy.

Remove from the air fryer and immediately sprinkle with the cinnamon-sugar mixture while still warm. Serve with caramel sauce or vanilla ice cream.