Preheat your oven to 350°F (175°C). This ensures that your brownies bake evenly.
Line your baking pan with parchment paper, leaving some overhang on the sides. This will make it easier to lift the brownies out later.
In a medium saucepan over low heat, melt the unsalted butter. Once melted, remove it from the heat and let it cool slightly.
In a mixing bowl, whisk together the granulated sugar and espresso powder. The espresso powder enhances the chocolate flavor, making your brownies even more decadent.
Pour the melted butter into the sugar mixture and stir until well combined. Add the eggs one at a time, mixing well after each addition. Finally, stir in the vanilla extract.
In a separate bowl, sift together the Dutch cocoa powder, all-purpose flour, baking powder, and table salt. Sifting helps to eliminate lumps and ensures a smooth batter.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix; you want the batter to remain thick and fudgy.
Gently fold in the semisweet or milk chocolate chips. They will melt slightly in the oven, creating pockets of gooey chocolate throughout your brownies.
Pour the brownie batter into your prepared baking pan and spread it evenly. Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Let the brownies cool in the pan for about 10 minutes before lifting them out using the parchment paper. Allow them to cool completely on a wire rack before cutting into squares. Enjoy your Homemade Fudgy Brownies!