Preheat oven to 350 degrees.
Line a 9x13 baking dish with parchment paper.
In a large bowl microwave safe bowl combine the ½ cup of butter and chocolate chips.
½ cup butter, 8 ounces semisweet chocolate chips
Melt in the microwave in 30 second intervals until melted and smooth.
To the chocolate add your sugars, vanilla, eggs, cocoa powder and oil.
1 cup granulated sugar, 1 cup brown sugar, 2 teaspoons vanilla extract, 2 large eggs plus 2 yolks, ¼ cup cocoa powder, ½ cup vegetable oil
Stir until combined.
Stir in the flour.
1 ¼ cups all-purpose flour
Spread the brownie batter into the pan.
Bake until a toothpick inserted in the center comes out clean, 30 to 35 minutes.
Meanwhile, make the ganache.
To a small sauce pan add your 4 tablespoons of butter, sweetened condensed milk and candy melts.
4 tablespoons butter, ½ cup sweetened condensed milk, 10 ounces green candy melts
Over low heat stir until all melted and smooth.
Remove the brownies from the oven and top with the ganache and spread over the brownies.
Quickly top with the rainbow chips.
¼ cup rainbow chocolate chips
Set aside to cool completely.
Once cool you can take your Christmas tree cookie cutter and begin to cut out trees and set aside.
Serve!