Adult supervision is needed to shrink your charms. First, preheat your oven to 325 °F (160 °C). Place the colored charms with the textured side up on a baking sheet lined with some parchment paper. Bake for 1-3 minutes. We recommend keeping an eye on the charms as they shrink, it will ensure everything goes smoothly, and it is super fun to watch! Your charms will curl up as they shrink, this is normal. Once they are finished baking they will flatten out again. If your charms are still curled, or have a deep dent in the center, they need a little more baking.  (In the video you can see what the shrinking process looks like). Immediately after you remove the charms from the over, we recommend you gently press them flat with a spoon or spatula, to make sure they stay perfectly flat.