Preheat oven to 325 degrees. Line a half sheet pan with parchment paper or foil. Leave a slight excess on two sides for easier removal. If you are not lining the sheet pan, lightly grease.
Combine cookie ingredients, press evenly into the bottom of the lined half sheet.
Combine apple pie ingredients, including melted butter, and layer evenly over cookie layer.
Cut butter into the crumb ingredients until the mixture resembles coarse crumbs and sprinkle evenly over the apple filling.
Bake at 325 degrees for 40-50 minutes, until middle is set and bottom of crust is golden brown. If crumb edges begin to darken too quickly, cover the edges with foil and continue cooking until set. Cool completely before slicing. To remove from pan, simply lift the entire slab out by grabbing the excess lining (parchment or foil) on each side and carefully lifting out. Cool before slicing.