Line a baking sheet with parchment paper and spray with cooking spray. Set aside.

Prepare the brownie mix according to the package directions and spread onto the prepared baking sheet. Bake for about 20-22 minutes, or until done.

Allow brownies to completely cool before removing them from the baking sheet. Use a tree-shaped cookie cutter to carve out the Christmas tree shapes.

For the decorations: Spoon out approximately ½ of the tub of icing into a bowl. Add in the green food coloring until you're happy with the color. Spoon the green icing into a zip lock bag. Seal the bag and cut off a small corner of the bag with sharp scissors.

Starting at the top of the brownie triangles, gently squeeze out the icing in a zigzag pattern as you go down the tree. Add your favorite sprinkles & Enjoy!