Preheat oven to 400°F. Place one unbaked pie shell in 9" pie plate. If desired, use the remaining pie shell to cut leaves and place on edges of pie crust with a little bit of water to make them stick. Set aside
Pare, core, and cut apples into thin slices. Place in large bowl. Sprinkle with lemon juice. Set aside. Mix ½ cup sugar and cinnamon. Fold into apples. Pour into pie crust and distribute apples evenly.
For the streusel topping
In a medium bowl, mix ⅓ cup sugar with flour, cut in butter until crumbly. You can use a pastry blender for this step or simply use your fingers to blend the butter into the flour mixture. Sprinkle on top of apples.
Bake at 400 degrees for 35-40 minutes or until done. If pie crust browns too quickly, cover edge with foil. Cool slightly. Serve with ice cream, if desired. Store covered in the refrigerator for up to 3 days.
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Notes
Instead of baking the pie, you can freeze it for later. Make sure to cover well with plastic wrap. Once you're ready to bake, if frozen: bake 30 min covered, 45-60 uncovered.If you have extra pie crust, you can cut out extra leave, sprinkle with cinnamon sugar and pop them in the oven for 15 minutes. Makes a yummy little cookie to snack on.