Preheat oven, prepare brownie mix and bake brownies in a 9x13 pan according to package directions. Allow brownies to cool completely.
In a medium sized bowl, beat your softened butter until smooth, about 2 minutes.
Add your powdered sugar, milk, peppermint extract and food coloring and bet on high for 1 to 2 minutes. (Add a little more powdered sugar or milk if needed for the a smooth spreadable texture)
Spread frosting evenly over the top of cooled brownies. Allow frosting to set.
Cut brownies into 15 to 18 pieces and remove from pan.
Melt chocolate chips in the microwave for about 1 minute and stir till smooth.
Put melted chocolate in a ziplock bag and snip the corner off.
Drizzle chocolate over each brownie piece to make hair and mouth.
Stick 2 candy eyes on and 1 m&m for the face.
Stick 2 pretzel stick pieces (break them in half!) into the sides of each brownie at the very bottom.
Enjoy.