Buckeye Brownies

INGREDIENTS

• :
• ⅓ cup Dutch-processed cocoa
• 1½ teaspoons instant espresso (optional)
• ½ cup plus 2 Tablespoons boiling water
• 2 ounces unsweetened chocolate, finely chopped
• 4 tablespoons (2 ounces) unsalted butter, melted
• ½ cup plus 2 Tablespoons vegetable oil
• 2 eggs
• 2 egg yolks
• 2 teaspoons vanilla extract
• 2½ cups granulated sugar
• 1¾ cups all-purpose flour
• ¾ teaspoon salt
• ¾ cup creamy peanut butter
• ½ cup unsalted butter
• Pinch salt
• 2¼ cups powdered sugar
• 2 tablespoons whole milk
• 1 teaspoon vanilla extract
• 1½ cups milk chocolate chips
• ⅓ cup creamy peanut butter