Place the Oreo cookies in a food processor. Process until the cookies become fine crumbs.
Reserve 2 tablespoons of the cookie crumb mixture. Set them aside in a small bowl.
In the bowl of a stand mixer fitted with a paddle attachment, combine the rest of the cookie crumbs with the cream cheese. Blend until a soft dough forms.
Line a baking sheet with wax paper. Using your hands, roll the cookie dough into 1-inch balls, and place the balls in a single layer on the prepared baking sheet.
Place the baking sheet in the freezer for 15-20 minutes or until the dough balls are firm.
Set out 2 small microwave-safe bowls. Place the dark chocolate wafers in one bowl and 1 cup of white chocolate wafers in the other. Melt the chocolate in the microwave according to the instructions on the package, heating the chocolate until it is completely melted and smooth.
Remove the dough balls from the freezer. Dip half of the dough balls in the dark chocolate and the other half in the white chocolate, rolling to coat them. Use 2 forks to help you coat them more easily.
Sprinkle the remaining Oreo cookie crumbs on the white chocolate truffles, ensuring that the crumbs stick before the chocolate hardens.
Prepare a disposable pastry bag. With a pair of scissors, snip a small hole at the tip.
Place the remaining 1/4 cup of white chocolate wafers in a small microwave-safe bowl. Melt the chocolate in the microwave according to the instructions on the package, heating the chocolate until it is completely melted and smooth.
Immediately pour the melted white chocolate into the pastry bag. Pipe the white chocolate onto the dark chocolate truffles.
Allow the truffles to harden before transferring them to mini muffin cup liners. Store them in the refrigerator. Enjoy!
We recommend Ghirardelli melting wafers for coating your truffles, since they coat evenly and smoothly. If you're unable to purchase these and opt for an alternative, adding 1/2 teaspoon of shortening for each ounce of chocolate when melting will result in a smoother, more manageable consistency.