Line a large baking sheet with parchment paper or a silicone baking mat.
Place the entire package of Oreo cookies (including the cream filling) into a food processor. Pulse until they form fine, sandy crumbs.
In a large bowl, combine the cookie crumbs and the softened cream cheese. Mix thoroughly with a spatula or hand mixer until a thick, cohesive dough forms.
Using a small cookie scoop, portion the dough and roll it between your hands to form 1-tablespoon-sized balls. Place them on the prepared baking sheet.
Chill the baking sheet in the freezer for 15 to 20 minutes until the balls are very firm.
In a microwave-safe bowl, melt the white candy melts in 30-second intervals, stirring smoothly after each until completely fluid.
Remove the firm truffles from the freezer. Drop them one at a time into the white candy coating. Roll with a fork to coat, tap off the excess, and place back onto the parchment paper. Allow a little extra coating to pool at the base to look like a ghost's sheet.
While the coating is still wet, carefully place two mini chocolate chips on the front of each truffle to create eyes.
Let the truffles set completely at room temperature or in the refrigerator before serving.