In another bowl, add chopped apple and cornstarch. Mix to fully coat apples.
Fit your mixer with the paddle attachment. Over medium speed, beat butter and sugars until smooth. Beat in egg and vanilla extract. Slowly beat in flour mixture until fully combined. Then, fold apples into the dough.
In a small bowl, mix cinnamon and sugar. Roll dough into tablespoon sized balls of dough and then roll into the cinnamon sugar mixture. Transfer to a parchment paper lined baking sheet.
Bake cookies for 10-12 minutes. A toothpick should run through the cookie and come out clean. Transfer cookies to a cooling rack.
Keyword apple cinnamon cookies, apple cinnamon muffin cookies, apple dessert recipe