Preheat the oven to 350°F. Grease and line an 8X8-inch with parchment paper. Set it aside.
Prepare a double boiler and melt the chocolate and butter until smooth and shiny. See notes.
6 Ounce Dark chocolate, ⅓ cup+1 tablespoon Butter
Use a hand mixer or stand mixer set on the paddle attachment. Beat the eggs and both sugars. Beat this mixture for 3-4 minutes until it is light and pale in color.
2 Eggs, ¾ cup Granulated sugar, ¼ cup Brown sugar
Add the vanilla extract and mix.
2 teaspoon Vanilla extract
Mix in the chocolate mixture and mix.
Sift the flour and cocoa powder, then add them to the batter. Use a spatula to fold the dry ingredients into the mixture. Do not overmix.
1½ tablespoon Cocoa powder, ½ cup All-purpose flour
Pour the batter into the lined pan, and smooth out the top. Bake it for 20-25 minutes. Bake it for 20-25 minutes. Let the brownie cool down for at least 2 hours before