Make the cookie ball filling:

1. Pulse together the OREO cookies in a food processor fitted with the blade attachment until finely-crushed. Cut the softened cream cheese into tablespoon-sized pieces and add to the OREO crumbs, pulsing until smooth and completely combined. The mixture will be thick and sticky. Refrigerate for 10-15 minutes until chilled through.
2. Alternatively, place the OREOS in a plastic freezer bag, and use a rolling pin to finely crush into crumbs. Stir in the softened cream cheese until smooth and completely combined.
3. Shape into 48 (1-inch) balls. I like to use a small cookie scoop to scoop out uniform cookie balls, then use my hands to gently roll into smooth balls. Freeze for 10 minutes.

To coat and decorate:

1. Line a sheet pan with parchment paper or a Silpat baking mat. Set aside.
2. Melt the white chocolate in either a double-boiler over gently simmering water, or in a heat-proof glass bowl in the microwave. If using a microwave, heat in bursts of 30 seconds on medium power, stirring well and scraping down the sides of the bowl with a spatula after each increment, until the chocolate is completely melted and smooth.
3. Dip the cookie balls in the melted chocolate, one at a time, using two forks or a candy dipping tool to roll until evenly coated. Let the excess chocolate drip back into the bowl, then transfer the chocolate-covered cookie balls to the prepared pan and let sit until the chocolate is set. Work in batches until all cookie balls are coated.
4. Drizzle with additional melted chocolate or decorate with sprinkles or OREO crumbs, as desired.
5. Refrigerate for at least 20 minutes, or until firm. Keep refrigerated.