Preheat oven to 350ºF and line a baking sheet with parchment paper. Place all ingredients in a large bowl, mix until combined. Use a cookie scoop to scoop out dough into your hands. Roll in the palm of your hands to create a ball, then flatten into a cookie shape. Bake cookies for about 12-15 minutes. Let cool before piping.
For The Frosting
Place all ingredients in a medium-size bowl. Using a mixer, whip on low speed until butter starts to soften. Increase speed until it becomes a lighter white color, about 1 minute. Transfer frosting into a piping bag and pipe reindeer design on cookies. Place one cinnamon red hot for the nose. Enjoy!