First, let’s make the crumble topping. Preheat the oven to 300.
Mix all the crumble topping dry ingredients together.
Add in the melted butter and vanilla extract and mix just until a crumbly texture comes together.
Spread out on the crumble on a cookie sheet and bake for 15 minutes, stirring the crumbs at the halfway point. Allow to cool and set aside.
Now, lets move on to make the cookies: Preheat the oven to 350.
Add the butter and both sugars to a bowl (or mixer on slow) and begin to work the butter into the sugar until creamy.
Next, add in the egg yolks and vanilla extract and mix slowly, but well, until creamy and smooth.
Lastly, add in the flour, remaining dry ingredients, and mix until the dough comes together.
Line a cookie sheet with parchment paper. Using a big cookie scoop (3 tbsp), scoop out the dough and place on the cookie sheet, leaving a good amount of space in between (I do 5 at a time).
Bake for 13-14 minutes until just lightly golden. Allow to cool completely.
Lastly, for the frosting. By hand or slowly in a mixer, cream the butter until just smooth.
Then, add in the powdered sugar and vanilla and cream together until smooth, creamy and fluffy.
Lastly, chop up your peach pie filling. This makes the cookie texturally superior and is easier to eat so you get the yummy filling in every bite.
To assemble: Once the cookies are totally cooled, pipe on a generous amount of frosting, then dollop on the peach pie filling, then finish it with the crumble topping.