Prepare and Bake the Brownies
1- Preheat oven according to brownie mix package directions. Line an 8×8 inch baking pan with foil, extending it over the edges, and spray with cooking spray.
2- Prepare brownie batter according to package directions. Pour into prepared pan.
3- Bake for 25-30 minutes, until a toothpick inserted into center comes out with moist crumbs.
4- Cool completely in pan for 1.5 hours. This is crucial for clean cuts.

Cut and Assemble the Trees
1- Use foil sling to lift brownie slab onto cutting board.
2- Cut into three long, even rows. Then cut each row into four triangles by making alternating diagonal cuts.
3- Break candy canes into 1.5-inch pieces from curved part. Press one piece into flat bottom of each triangle to create tree trunk.

Frost and Decorate
1- Mix half the vanilla icing with 1/4 tsp green food coloring until evenly colored.
2- Transfer green icing to zip-lock bag and snip tiny corner.
3- Pipe icing in curvy zigzag pattern onto each brownie triangle to create garland effect.
4- Immediately decorate with round sprinkles for ornaments and top each tree with a star sprinkle.