Cocoa Brownies

Bahan-bahan (16 porsi)

• 11 tablespoons unsalted butter
• 1¼ cups granulated white sugar
• 1 scant cup (3 ounces) unsweetened cocoa powder, (natural or Dutch process)
• ¼ teaspoon salt
• 1 teaspoon vanilla extract
• 2 large eggs
• ⅓ cup + 1 tablespoon (1.75 ounces) all purpose flour