1. Line a large baking tray with parchment paper and set aside. Unwrap all Reese’s cups and arrange decorating supplies in small bowls.

2. Place white chocolate chips or chopped bars in a large microwave-safe bowl. Add 2–3 teaspoons of oil.

3. Microwave at 50% power for 20 seconds, stir thoroughly, and repeat 4–6 times until smooth and fully melted.

4. Check consistency — chocolate should flow like heavy cream. Add more oil if too thick.

5. Place one Oreo at a time on a fork and dip completely into melted chocolate, using a spoon to coat evenly.

6. Lift and gently tap the fork handle on the bowl’s edge to remove excess chocolate.

7. Use a toothpick to slide the coated Oreo onto the parchment-lined tray.

8. Before the coating sets (within 30–45 seconds), sprinkle holiday decorations and candies on top.

9. Add a small dollop of melted chocolate to the bottom of a Reese’s cup and press it onto the center of each cookie to form the ornament “cap.”

10. Repeat with remaining cookies, reheating chocolate briefly as needed.

11. Chill cookies for 20–30 minutes until chocolate is firm.

12. Store in airtight container or serve immediately on a festive platter.