Preheat the oven to 325ºF. Line an 8x8 metal baking pan with parchment paper. Set aside.
Place the butter in a large bowl and microwave until melted.
Add the granulated sugar, brown sugar, and molasses. Whisk to combine. It should be a little sandy looking. Microwave for another 30 seconds and whisk until completely combined.
Add the vanilla and eggs and whisk for about one minute or until smooth and glossy.
Add the cocoa powder and whisk gently until combined.
Fold in the flour and salt with a rubber spatula.
Fold in the chocolate chips.
Transfer the batter to the prepared baking dish and smooth out evenly. Top with a sprinkling of flaky salt if desired.
Bake for 40 minutes or until a toothpick inserted in the center comes out with moist crumbs attached.
Allow to cool completely on a wire rack before using the parchment paper to remove them from the pan. Slice and serve.
Video
Notes
Tips for customizing cocoa powder brownies
Swap the semisweet chocolate chips for dark, white, or milk chocolate, or try peanut butter or cinnamon chips
Skip the salt on top if you prefer
Use your favorite 1:1 gluten free flour blend to make these gluten free
Swap the Dutch process cocoa powder for regular unsweetened cocoa powder
If using unsalted butter, add ½ teaspoon of extra salt to the batter