Line a cookie sheet with parchment paper to prevent sticking and ease cleanup.
Melt the black candy melts in a microwave-safe bowl, stirring every 30 seconds until smooth. Repeat with red candy melts in a separate bowl.
Dip an OREO cookie into the melted black candy melts, ensuring it is completely covered. Lift it out with a fork, allowing excess to drip off.
Place the dipped OREO on the lined cookie sheet. Repeat with remaining OREO cookies and allow to set for 5-10 minutes.
Melt more black candy melts and dip another OREO, placing it on top of the first for Mickey’s ears.
Drizzle melted red candy melts over the bottom half of each Mickey OREO to form his shorts, then allow to set.
While the red candy melts are still soft, place two white ball sprinkles for eyes and one for the button.
Allow the decorated OREOS to set completely at room temperature or refrigerate for faster results.