Spray the inside of each of the cookie cutters with cooking spray.
Set the cookie cutters on a cookie sheet lined with parchment paper or a silicone baking mat.
Arrange the peppermint candies in a single layer inside each cookie cutter. If you have empty gaps, cut some candies into pieces to fill them in. Do not layer the peppermint candies.
Place the cookie sheet in the oven for 6 to 9 minutes. Keep an eye on it near the end and remove it as soon as the candy melts enough to close all the gaps. Don't let it bubble.
Remove it from the oven and let it sit for 2 minutes. Then dip a wooden skewer in cooking oil and push it into the candy to make the hole for the ribbon.
Let them sit for 15 minutes, then gently pull the cookie cutters away from the edge of the shape and push out the candy piece. Don't wait until they are completely cold or they might crack when you remove them from the cookie cutter.
Add a 10 inch long piece of ribbon through the hole, tie it up and hang it on the tree!