Place peeled and broken crayon pieces in molds. Overfill the molds (especially if they are smaller hearts). The crayons melt to fill every empty space.
Put the silicone mold on a cookie sheet before putting it in the oven.
Place in the oven and cook for 8-12 minutes. Time may vary.
Once you see that the crayons have fully melted, pull them out of the oven immediately.
The wax will be very hot and liquid. How long your newly formed crayons need to cool will depend on the size of your molds.
Once one is completely cool to the touch, you can carefully push them out of the silicone mold.
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Notes
Adult supervision is required! Don't leave young children unattended with hot wax.
Pull out the crayons as soon as the wax is fully melted.
The hot wax will take around 20-30 minutes to harden and cool.
Cook time will vary depending on the size of your broken pieces and your oven settings.
If you have a stubborn crayon that will not melt, use a toothpick to stir the wax in the mold.