In a large bowl, add graham cracker crumbs, peanut butter, powdered sugar, and butter. Stir until uniformly combined and smooth.
Shape into teaspoon-sized balls and place on a baking sheet lined with parchment paper or a silicone mat. Chill at least 30 minutes.
Set chocolate in a bowl over a pot of simmering water (double-boiler method) or melt in the microwave at 50% power in 30-second increments (stirring well after each increment). Using two spoons, dip peanut butter balls into melted chocolate and transfer to prepared baking sheet. Chill at least 30 minutes to set chocolate.
This recipe will yield approximately 30 to 36 Peanut Butter Balls. The recipe doubles easily, so make extra!