Apple Crumble is a 9x13 pan dessert full of sweetened apples and a thick crumble layer with brown sugar and oatmeal. Serve it with some ice cream and you will be in heaven. I promise you'll believe it's the perfect crumble recipe.
Place the sliced apples in a 9x13 inch pan. Mix the white sugar, 1 tablespoon flour, nutmeg, and ground cinnamon together, and sprinkle over apples. Pour lemon juice on top.
For the Topping: Combine the oats, flour, brown sugar, cinnamon, baking powder, baking soda, nuts (if using) and melted butter together. Crumble evenly over the apple mixture.
Bake at 350 degrees for about 35-40 minutes or until apples are cooked and crumble is golden brown.
Serve warm with vanilla ice cream.