- Preheat the oven to 350°F.
- Peel and slice apples. In a bowl, mix sliced apples, brown sugar, cinnamon, nutmeg and lemon juice.
- To make crumble, mix oats and sugar until blended. Add warmed butter and mix just until crumbly (avoid over mixing).
- Fill pie shell with apple mix and cover with crumble topping.
- Bake for 1 hour. Serve with vanilla ice cream or whip cream.