Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.
In a microwave-safe bowl, melt the butter. Stir in the granulated sugar until well combined.
Whisk in the eggs one at a time, then stir in the vanilla extract.
In a separate bowl, whisk together the flour, cocoa powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
Pour the batter into the prepared baking pan and spread evenly.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached.
Let the brownies cool completely in the pan.
Once cooled, cut the brownies into a large rectangle, then cut out tree shapes using a knife or cookie cutter. You can trim the edges to create a more defined tree shape.
For the icing, whisk together powdered sugar, milk, and green food coloring until smooth. Add more milk or powdered sugar to reach desired consistency.
Decorate the brownie trees with the green icing and sprinkles.
Notes
Enjoy these festive brownie Christmas trees as a holiday treat!