Crush the Halloween Oreos until a fine powder is achieved, about 3-5 minutes.

Combine the crushed Oreos, softened cream cheese, and vanilla extract in a mixing bowl, blending until it resembles wet sand, about 2-3 minutes.

Shape the Oreo mixture into a rectangle on parchment paper, approximately 10x14 inches and ¼ inch thick, taking about 3-5 minutes.

Spread the Halloween-colored frosting evenly over the Oreo mixture, leaving a 1-inch border, taking about 2-3 minutes.

Roll the mixture tightly into a log shape using the parchment paper for guidance, which should take about 2-4 minutes.

Wrap the rolled Oreo mixture tightly in parchment paper and foil, refrigerating for at least 1 hour or freezing for 20 minutes.

Slice the roll into 1-inch rounds using a warm knife, taking about 3-5 minutes.

Decorate the slices with festive sprinkles, candy eyes, or chocolate drizzle, and serve cold or at room temperature.