This awesome frozen peanut butter cup pie is the perfect dessert or weekend treat for a hot summer day. The classic graham cracker pie shell and simple cream cheese and peanut butter filling take no more than 10 to 15 minutes to prepare; just mix, freeze, and enjoy. To make this even easier, use a store-bought deep-dish graham cracker pie shell. An oreo or chocolate cookie crust would be an excellent choice as well. Freeze the peanut butter cups to make chopping them much easier.