Prepare a baking sheet by lining it with parchment paper.

In a microwave-safe bowl, melt the white melting wafers in 30-second intervals, stirring each time, until the chocolate is smooth and fully melted.

Dip each Oreo cookie into the melted chocolate, flipping with a fork to coat it completely. Lift the Oreo and let any excess chocolate drip off before placing it on the prepared baking sheet.

While the coating is still soft, decorate with Christmas sprinkles or arrange them in a festive pattern. Press the flat side of a Reese's Mini Peanut Butter Cup gently onto the top edge of the Oreo to resemble an ornament.

Repeat with the remaining Oreos, then transfer the baking sheet to the freezer for about 10 minutes to allow the chocolate to set.

Once the chocolate has hardened, remove from the freezer and enjoy your festive treats!