peanut butter pie recipe

1 1/2 cups graham cracker crumbs - 1/3 cup granulated sugar - 6 tablespoons unsalted butter, melted **For the Filling:** - 1 cup creamy peanut butter - 1 cup powdered sugar - 8 ounces cream cheese, softened - 1 teaspoon vanilla extract - 1 cup heavy whipping cream **For the Topping:** - 1 cup heavy whipping cream - 2 tablespoons powdered sugar - 1 teaspoon vanilla extract - Chocolate shavings or peanut butter cups, chopped (optional, for garnish)