Bake crust until crisp, about 7 minutes. Let cool completely before filling. Stir with a fork first, and then your hands until the mixture is well combined. In a large bowl, mix the brown sugar, cinnamon and flour. Add the sliced apples and mix until they are coated well; Pour the apple mixture into the graham cracker crust and spread evenly; In a separate bowl, add the ingredients for the top crust which include the flour, brown sugar, softened butter and egg. Crust may also be wrapped tightly in plastic and frozen up to one month. Using your fingers and the bottom of a measuring cup or glass, press the crumbs firmly into the bottom and up the sides of a 9-in deep-dish pie pan. Combine crumbs, butter, oats, brown sugar, vanilla and salt, stirring until crumbs are moistened. Press into the bottom and up the sides of a 9-inch pie plate. Press mixture evenly across 9-inch pie plate. Combine the graham cracker crumbs, brown sugar and melted butter in a mixing bowl. Mix until smooth. Combine the cracker crumbs, the brown sugar and butter in a small bowl, blending well. Step 1: Make The Crust.