Preheat oven to 350ºF.

Topping- Mix flour, sugar and butter in a bowl; set aside.

Wash, peel and core apples. Dip apples in lemon juice. Cut apples into medium slices.

Mix all dry ingredients in a bowl; add butter and apple slices; mix well.

Place pie shell in a 9 inch pan. Pour mixture into pan. Pour the topping mixture on top of the apple mixture. Bake for 20 minutes or until crust is golden brown.