Apple Crumble Cookies

Prep: Preheat oven to 350°F. Grease a 12-hole muffin pan with cooking spray or oil.
Crumble mixture: In a medium mixing bowl, stir together the flour and brown sugar. Pour in melted butter and vanilla extract. Mix with a spatula until it becomes a crumbly mixture that holds together when squeezed. Set aside while you prepare the apples.
Apple filling: In a large mixing bowl, add the diced apples, brown sugar, lemon juice, cornstarch, and cinnamon. Mix together until the apples are coated.
Cookie base: To your muffin pan, add about 1 ½ tablespoons of crumble into each hole. Use the back of a spoon or the flat end of a rolling pin to firmly press the mixture down into a flat layer for the base of the cookies.
Apple layer: Add 1 heaping tablespoon of apple filling into each hole on top of the base.
Crumble topping: Sprinkle 1 tablespoon of crumble on top of the apple filling.
Bake: Bake for 20-25 minutes or until the crumble is lightly golden brown.
Cool: Let the cookies cool completely in the pan to allow the crumble to firm up. Remove them from the pan by using a fork to lift each cookie from one side.