In a bowl, mix the pumpkin puree, cream cheese, vanilla extract, and pumpkin pie spice until smooth.
Stir in the graham cracker crumbs until well combined.
Chill the mixture for 1 hour until firm enough to handle.
Scoop small amounts of the mixture, roll into balls, and place them on a baking sheet lined with parchment paper.
Melt the white chocolate chips in a microwave or double boiler.
Dip each truffle ball into the melted chocolate, ensuring it is fully coated.
Place the coated truffles back on the parchment paper and refrigerate until set.