Preheat your oven as directed on the brownie mix box. Spray a 9-inch springform pan with cooking spray to prevent sticking.

Combine both boxes of brownie mix or prepare a double batch of homemade brownies following your recipe or package instructions. Pour the batter evenly into the prepared springform pan.

Bake according to package instructions or until a toothpick inserted in the center comes out clean. For a double batch, baking time may be longer than usual.

Once baked, allow brownies to cool completely. Remove from the springform pan and place on a cutting board. Cut the brownies into 8 triangular pieces.

In separate small bowls, tint white frosting with red food coloring in one bowl and green food coloring in another. Leave some frosting white. Adjust the amount of coloring for desired shade and amount of frosting thickness.

Dispense red, green, and white frostings into individual icing bags fitted with large star tips (1M).

Use green frosting to create Christmas tree designs on some brownies, decorating with white pearl sprinkles and edible gold stars. For Santa hat brownies, combine green and white frosting for decoration.

Serve decorated brownies immediately and enjoy your festive treats!