For the cookies
- All purpose gluten free flour
- Xanthan gum
- Cornstarch
- Confectioners’ sugar
- Kosher salt
- Baking soda
- Unsalted butter
- Egg
- Pure vanilla extract
For the frosting (optional)
- Confectioners’ sugar
- Light corn syrup
- Lukewarm water
- Gel food coloring
- Or Royal icing
- Gluten free rainbow nonpareils