Grease an 8 x 8 inch baking pan and line with parchment paper. Set aside.
Add the unsalted butter in a non-stick frying pan and place over medium heat. Stir continuously as the butter melts.
1 cup Unsalted Butter
Once the butter has melted it will start foaming and sizzling. Continue stirring for about 6 more minutes or until the butter turns golden brown. It will smell very buttery and nutty.
Remove immediately from heat and pour into a medium heat-proof, glass bowl. Make sure to include the brown bits from the bottom of the pan.
Stir in the dark and semi sweet chocolate chips, cocoa powder, vanilla extract and crème de cacao until fully incorporated.
1/2 cup Dark Chocolate Chips, 1/2 cup Semi Sweet Chocolate Chips, 2 tbsp Cocoa Powder, 1 tbsp Pure Vanilla Extract, 1/2 cup Creme de Cacao
Let the chocolate mixture cool for 10 minutes.
Preheat oven to 325°F (160C).
Using a hand/stand mixer with the paddle attachment on, pour the sugar and beat on medium speed adding one egg at a time. The mixture should be light and fluffy.
1 cup Granulated Sugar, 3 Eggs
With the mixer running on low, incorporate the slightly cooled chocolate mixture. Mix until just combined.
Gently, fold in the sifted all-purpose flour and salt using a spatula. When there are no more visible flour lumps, stop mixing.
1 1/2 cups All Purpose Flour, 1/2 tsp Salt
Transfer the batter into the lined baking pan and bake for 25 minutes or until an inserted toothpick in the center, comes out clean with little to no lumps.
Remove from oven and allow brownies to completely cool down.