Reindeer food is a special treat made from oats and glitter that is left out on Christmas Eve for the reindeer to eat. To make reindeer food, simply mix together 1/4 cup of oats, 1/2 teaspoon of glitter, and a few drops of vanilla extract in a bowl. Stir the mixture until it is well combined, then spread it out on a baking sheet and bake it in the oven for 10-15 minutes at 350 degrees Fahrenheit. Let the mixture cool completely before storing it in an airtight container.