Rich, fudgy brownies made with unsweetened cocoa powder and all-purpose flour for a deep chocolate flavor and chewy texture. Perfect for chocolate lovers, these easy-to-make treats are a crowd-pleaser.
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Preheat your oven to 350°F (175°C). Grease an 8x8-inch baking pan and line it with parchment paper, leaving an overhang for easy removal.
In a medium saucepan over low heat, melt the butter. Remove from heat and stir in the sugar, eggs, and vanilla extract until smooth.
Sift in the cocoa powder, flour, salt, and baking powder. Stir until just combined. Fold in the walnuts if using.
Pour the batter into the prepared pan and spread evenly.
Bake for 20-25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Allow to cool completely in the pan on a wire rack before cutting into 16 squares.