01 -
Preheat your oven to 175°C and line an 8×8-inch baking pan with parchment paper.
02 -
Melt the unsalted butter in a medium saucepan over low heat.
03 -
Add dark brown sugar and granulated sugar to the melted butter and stir until smooth.
04 -
Beat in the large eggs one at a time, mixing well after each addition, then stir in the vanilla extract.
05 -
In a separate bowl, whisk together the all-purpose flour, unsweetened cocoa powder, salt, and baking soda.
06 -
Gradually add the dry mixture to the wet mixture, stirring gently until just combined.
07 -
Fold in the semisweet chocolate chips if using.
08 -
Pour the batter into the prepared baking pan and spread it evenly.
09 -
Bake for 20-25 minutes, checking for doneness with a toothpick.
10 -
Allow the brownies to cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.