Prepare brownies as instructed and let cool. Once cooled, cut into 3 equal horizontal rows. Then cut diagonally one way 4 times, then cut diagonally the other way to create triangles.
Remove to serving platter. Color vanilla icing with 3 drops of brown food coloring. Make sure to fully incorporate. Spread brown icing all over the top of the brownie, with point of triangle as the bottom, place two mini pretzel twists on each corner to look like antlers. Place two candy eyeballs side by side in center and place red or brown M&M towards the pint of the brownie to bring your reindeer to life.
Continue with remaining brownies, serve and enjoy!