Preheat the oven to 400 degrees F (200 degrees C.) Arrange apple slices in unbaked pie shell. Mix 1/2 cup sugar and cinnamon; sprinkle over apples. To make the crumble topping: Place 1/3 cup sugar and ...
Keep adding layers until all apples are used, adding some extra in center to make a slightly rounded top. For the pie topping, into a large bowl, add all ingredients. Mix until evenly incorporated.