Line a 7×7 square baking pan with parchment paper, grease it with butter, and set it aside for later. Then preheat your oven to 180 degrees Celcius, 350 degrees Fahrenheit.

Take a medium-sized mixing bowl, add 1/2 cup melted butter, 3/4 cup granulated sugar, and 1/2 cup brown sugar, and mix well.

Pour two drops of vanilla essence, crack in 2 large eggs one by one into the bowl, and start whisking. Whisk until a smooth batter forms.

Sieve in ½  cup of all-purpose flour and cocoa powder each into the bowl and mix it lightly using a spatula.

Chop some semi-sweet dark chocolate and mix it in. Set aside.

Pour the brownie mixer into the prepared pan and spread it evenly. Make sure to tap and flatten the top using a spatula.

Place it in the oven and bake for about 30 minutes at 180 degrees Celsius in a preheated oven.

Once done, take the prepared brownie out and let it cool completely to room temperature.

Dip a knife in water, dry it using a kitchen towel, and cut your brownie into pieces before serving. Enjoy.