Preheat the Air Fryer: Begin by preheating your air fryer to 320°F (160°C) for about 5 minutes.
Mix Dry Ingredients: In a medium bowl, combine the flour, baking powder, baking soda, salt, and ground cinnamon. Whisk together until well blended.
Cream Butter and Sugars: In a large bowl, use an electric mixer to cream together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy.
Incorporate Egg and Vanilla: Beat in the egg and vanilla extract into the creamed butter mixture until smooth.
Combine Mixtures: Gradually add the dry ingredient mixture into the wet mixture, mixing on low speed until just combined. If desired, fold in the chopped walnuts or pecans for added crunch.
Scoop the Dough: Using a cookie scoop or a tablespoon, drop spoonfuls of dough onto a parchment-lined air fryer basket, leaving space between each cookie as they will spread a little.
Prepare for Frying: In a small bowl, mix together a tablespoon of sugar with half a teaspoon of cinnamon. Sprinkle this mixture over the dough before cooking.
Air Fry the Cookies: Cook the cookies in the preheated air fryer for about 8-10 minutes, or until the edges are golden brown. You may need to batch cook if your air fryer basket is small.
Cool Down: Once cooked, carefully transfer the cookies to a wire rack and let them cool for 5 minutes before enjoying. They will continue to firm up as they cool.
Serve: Enjoy your sweet cinnamon drop cookies warm or store them in an airtight container to keep them fresh.
Notes
Optional walnuts or pecans can be added for extra crunch.