Preheat the oven to 350 degrees Fahrenheit.
Line baking sheet with parchment paper and set aside.
In the bowl of a stand mixer, fitted with the paddle attachment, combine brownie mix, flour, oil, 2 eggs, and water, mix until well combined.
Using a cookie scoop, scoop dough onto a prepared baking sheet.
Bake for 8 minutes, do not overbake these cookies, allow the cookies to rest on the baking sheet for about 2 minutes.
Carefully remove and place on a wire cooling rack. Allow cookies to cool completely before frosting.
Frost cookies with approximately 1 tablespoon of frosting (adjust to liking).
Place two pretzels at the top of the cookie for antlers.
Add red M&M for the nose.
Place 2 candy eyeballs between the nose and the antlers.