In a large bowl, mix together butter, peanut butter, and sugar until a thick dough forms. Fold in the crushed Oreo cookies.
Roll the mixture into balls and set onto a plate. Place chocolate chips into a microwave-safe bowl, and heat in the microwave in 30-second intervals, stirring well until it is fully melted and smooth. Coat each peanut butter ball in the mixture.
Set onto a plate and let sit until it is completely set.