01 -
Preheat oven to 175°C. Line a 23x23 cm square metal baking pan with parchment paper or aluminum foil for easy removal. Melt the butter fully and let it cool slightly to avoid curdling the eggs.
02 -
In a large mixing bowl, whisk together the cooled melted butter, granulated sugar, and vanilla extract until smooth and slightly paler in color. Whisk in the eggs one at a time until the mixture is glossy and well combined.
03 -
Add baking soda, salt, flour, and cocoa powder to the wet mixture. Gently fold with a spatula until just incorporated—do not overmix. Fold in the dark chocolate chips evenly. The batter should be thick and dense.
04 -
Transfer the batter to the prepared pan, smoothing it into the corners. Bake in the centre of the preheated oven for 25–30 minutes. The brownies are done when a toothpick inserted into the centre emerges with moist crumbs attached but no wet batter.
05 -
Allow the brownies to cool in the pan for at least 30 minutes before cutting for neat edges and optimal texture.