Peanut Butter Brownies

INGREDIENTS

• :
• 1¼ cups all-purpose flour
• 1 teaspoon salt
• 2 tablespoons dark unsweetened cocoa powder
• 11 ounces dark chocolate, coarsely chopped
• 1 cup (8 ounces) unsalted butter, cut into 1-inch pieces
• 1 teaspoon instant espresso powder
• 1½ cups granulated sugar
• ½ cup packed light brown sugar
• 5 eggs, at room temperature
• 2 teaspoons vanilla extract
• ½ cup (8 tablespoons) unsalted butter, melted
• 1 cup powdered sugar
• 1½ cups creamy peanut butter
• ½ teaspoon salt
• 1 teaspoon vanilla extract