Prepare pie crust: Put graham crackers in zip lock bag. Use roller to crumble (I use a can good from the pantry!) Combine melter butter with graham crackers and press into a 9" pie pan.( You could skip this step and just buy a prepared graham cracker crust in the baking section at the grocery store).
Pour pie filling into crust and bake at 350° for 15 to 20 minutes or untill set (not jiggley). Remove and cool for about 5 minutes( long enought to mix the topping).
Topping: Blend sour cream, sugar and vanilla. Pour over pie and bake 10 minutes.