Preheat oven to 350 degrees F.
Cream butter in an electric mixer. Mix in sugar and brown sugar and beat until creamy, 4-5 minutes.
Mix in the egg and vanilla.
In a small bowl, whisk together flour, salt, cinnamon, corn starch, and baking soda.
Add flour mixture to butter mixture and mix until dough is formed.
Coat muffin pan with non-stick cooking spray.
Roll 2 tablespoons of dough into a ball shape. Press the dough into muffin cups. Press the center of the dough to form a cup shape.
Bake for 10-12 minutes. Once baked, use the back of a spoon to press center of each cookie cup to form a well.
Let the cookies completely cool before filling with the apple filling.
Fill each cookie cup with cooked apples.