Preheat oven 400ºF. In large bowl, combine apple slices and lemon juice. In small bowl, combine 1/4 cup sugar, flour and cinnamon. Sprinkle sugar mixture over apple slices; mix well to coat.
Line pie pan with crust, forming a fluted edge. For topping, combine the remaining sugar and all other ingredients until crumbly. Pour filling into crust. Sprinkle with topping.
Bake 35-40 minutes or until bubbly and streusel is crisp. (Cover pie loosely with aluminum foil during last 10 minutes to avoid overbrowning). Cool pie in pan on cooling rack at least 1 hour before serving.