In a large mixing bowl, combine the melted unsalted butter, creamy peanut butter, and vanilla extract. Mix well until smooth and fully combined.
Gradually add in the confectioners sugar and graham cracker crumbs. Mix until the mixture is thick and holds together well. Adjust the amount of graham cracker crumbs if needed.
Cover the bowl with plastic wrap and chill the mixture in the refrigerator for about 30 minutes to make it easier to scoop and shape.
Once chilled, use a cookie scoop or tablespoon to portion out the mixture. Roll each portion into a 1-inch diameter ball and place them on a parchment-lined baking sheet.
In a microwave-safe bowl, melt the white chocolate wafers in 30-second intervals, stirring between each interval until smooth and fully melted.
Using a fork or dipping tool, dip each peanut butter ball into the melted white chocolate, allowing excess to drip off. Return to the parchment-lined baking sheet.
While the chocolate is still wet, sprinkle with holiday sprinkles if desired for a festive touch.
Refrigerate the truffles for about 15-20 minutes or until the chocolate coating is set and firm to the touch.