Crush oreo cookies in a food processor or plastic bag into fine crumbs.
Combine cream cheese and cookie crumbs together until the mixture is a dark truffle-like texture.
Firmly press 1-2tbsp of the mixture into the ghost mold cavity. Refrigerate until firm or freeze for 20 minutes to speed up the process.
Melt white chocolate wafers according to package directions. Gently remove the ghosts from the mold and dip them into melted chocolate. Place on a parchment-covered baking sheet. Refrigerate for 10-15 minutes.
Use black icing or melted black wafers in a piping bag to add the ghost eyes and mouth.
Keep the truffles refrigerated until ready to serve.