Lunchbox Brownies | Lessons in Chemistry Recipes

Ingredients

• 8 tablespoons (1 stick) unsalted butter (110g), melted
• 1 cup granulated sugar (200g)
• ½ cup unsweetened cocoa powder (50g)
• 2 large eggs
• 1 teaspoon vanilla extract (4g)
• ½ cup all-purpose flour (75g)
• ½ teaspoon kosher salt (2g)
• ¼ teaspoon baking powder (1g)
• 2 tablespoons unsalted butter, melted (30g)
• ¼ cup powdered sugar (30g)
• ⅓ cup smooth peanut butter (90g)
• ¼ teaspoon kosher salt (1g)