Preheat oven to 350 degrees. Line two baking sheets with parchment paper.
In a medium bowl, whisk together cookie mix and flour. Add water and melted butter, stir until dough forms.
On a lightly floured surface, roll dough out to 1/4-inch thickness. Using a gingerbread cutter, cut out reindeer, place them on prepared baking sheets.
Bake 8-10 minutes or until the edges are firm (Do not over bake). Cool on sheets for 1 minute; remove to wire racks to cool completely.
Place 1/4 white frosting and green food coloring into a piping bag fitted with a small leaf tip #352. Place 1/4 white frosting and black food coloring into a piping bag fitted with a small round tip #5. Place remaining 1/2 tub white frosting into a piping bag fitted with a small round tip #5.
“Glue” on candy eyes and a red hot nose with white frosting. Pipe eye brows, ears, and antlers, with white frosting. Pipe a mouth with black frosting. Pipe two green leaves. Place three “holly berries” red confetti sprinkles over leaves.
Allow cookies to set up/dry for an hour or two before serving.