Mocha Brownies

INGREDIENTS

• :
• ¾ cup all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon salt
• ½ cup unsalted butter
• 3 ounces unsweetened chocolate
• ½ cup granulated sugar
• ½ cup light brown sugar
• 4½ teaspoons instant espresso powder
• 2 eggs
• 1 egg yolk
• 1 teaspoon vanilla extract
• ¾ teaspoon vanilla extract
• ¾ teaspoon instant espresso powder
• ½ cup unsalted butter, at room temperature
• 1¼ cups powdered sugar
• 1½ teaspoons heavy cream