Sprinkle granulated sugar over the apples and toss to coat.
Cover bowl and set aside for one hour.
Apple Filling
Preheat oven to 350°
Drain macerated apples and discard juice.
Sprinkle cornstarch, brown sugar, cinnamon and nutmeg over the apples and toss to coat evenly.
Pour apples into pie tin.
Crisp Topping
Place vegan butter, brown sugar, flour, oatmeal, cinnamon and nutmeg in a bowl. Using your hands or a pastry cutter, work the dry ingredients into the butter until coarse.
Pour crisp topping over the apples. Lightly press with your hands.