Mix all the ingredients in a saucepan. Cook over medium heat and stir constantly for about 3 to 5 minutes. It will look runny and begin to form into a ball as you cook and stir it. (Even if it looks too watery, just keep stirring and cooking it.)
After it forms into a ball in the center of the pot and you can no longer stir it (it will get very thick), remove the pan from the heat. (Don't cook it too long, or it will be dry.)
Remove the dough from the pan and knead in the peppermint essential oil and the glitter.
Cool and store in an airtight container.