Preheat the oven to 180 degrees Celsius.
Line the brownie pan with baking paper/wax paper to avoid the brownie from sticking to the pan. Make sure to leave an overhang of baking paper on either side - this makes it easy to lift the brownies from the pan.
Melt the chocolate and butter in a microwave-safe bowl or over a double boiler* until both ingredients are fully melted and combined.
113 grams semi-sweet chocolate, 175 grams unsalted butter
Add the granulated sugar to the chocolate mix and stir it with a whisk until combined while it’s still hot.* Make sure to mix it for at least 3-5 minutes (PS: the sugar will not dissolve completely, so don’t worry if the batter looks grainy at this point)
400 grams granulated sugar
Once the sugar is combined, add the eggs and vanilla extract, and whisk it again until the eggs are well incorporated into the chocolate batter.
3 eggs, 1/2 tsp vanilla extract
Add the cocoa powder, all-purpose flour, salt, and chocolate chips and fold them into the chocolate batter using a spatula or a wooden spoon. This takes some time and energy, so be patient while you’re doing it. There should be no streaks of flour left in the batter by the time you’re done mixing it all in
125 grams all-purpose flour, 85 grams cocoa powder, 1/2 tsp salt, Extra chocolate chips
After the dry ingredients are incorporated, you should end up with a very thick batter. Now it’s ready to be baked
Transfer the brownie batter to the prepared pan; make sure to spread it across evenly with a spatula
Bake it for about 30-40 minutes, until the brownies are cooked but still fudgy.* Once your top looks set and the test toothpick has some crumbs, your brownie is ready
Take out your brownies and let them cool completely before slicing into them