Shortbread Crust and Topping: – butter – all-purpose flour – quick oats
Preheat the oven to 350 degrees Fahrenheit and line a 8” x 8” square pan with a piece of parchment paper. Add all of the ingredients for the shortbread crust and topping to a large bowl and mix until combined.
Pour the remaining crust mixture into the prepared pan. Use your hands to press the crust mixture into the pan, creating an even layer. Poke the crust many times with a fork – this will prevent it from bowing up and ensure it is baked evenly.
While the crust is baking, prepare the apple filling. Peel, core, and slice the apples into thin slices. You will need 6 cups of sliced apples, which should be about 4 to 5 large apples.