Start by preheating your oven to 350°F (175°C). This ensures your brownies bake evenly and get that perfect fudgy texture.

In a microwave-safe bowl, combine the unsalted butter and dark chocolate. Microwave in 30-second intervals, stirring between each, until the mixture is completely melted and smooth. This will give your brownies a deep, rich chocolate flavor.

In a separate bowl, whisk together the granulated sugar, eggs, and vanilla extract. Beat until the mixture is smooth and slightly fluffy. This step helps to create the perfect texture.

In another bowl, sift together the unsweetened cocoa powder, espresso powder, all-purpose flour, and salt. Sifting will ensure no lumps in your brownies and a smoother texture.

Slowly add the melted butter and chocolate mixture to the wet ingredients, stirring to combine. Then, gradually fold in the dry ingredients until everything is mixed together. Be careful not to overmix to keep the brownies nice and fudgy.

Pour the batter into a greased 8x8-inch baking pan, spreading it out evenly. Bake for 20-25 minutes or until a toothpick inserted in the center comes out with a few moist crumbs. The brownies should still be a little soft in the center.

Let the brownies cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. This helps set the texture so they don’t fall apart when you cut them.