01 -
Preheat oven to 325°F.
02 -
Mix the flour, cocoa powder, and kosher salt in a bowl and set aside.
03 -
Using a hand mixer or standing mixer, combine the melted butter, sugar, and vanilla.
04 -
Add the eggs one at a time to the wet mixture, then slowly mix in the dry ingredients until fully combined.
05 -
Pour the batter into a greased and parchment-lined 9x13-inch baking dish and bake for 30 minutes.
06 -
Allow the brownies to cool completely, then use a cookie cutter to cut out Christmas tree shapes. Start on the edges and cut shapes close together to maximize the number of trees.
07 -
In a small bowl, mix powdered sugar and milk to create a frosting. Divide the frosting into two bowls, adding green food coloring to one. Transfer each frosting into separate ziplock bags, removing excess air and sealing the bags.
08 -
Snip a small hole in each bag corner. Pipe a zigzag pattern of green and white icing across the tree-shaped brownies. Immediately add holiday-themed sprinkles for decoration.
09 -
Serve the decorated Christmas tree brownies and enjoy!