Chocolate Blackout Cookies

Ingredients

• 1 large egg white
• 1¾ cups powdered sugar
• 4 ounces semisweet chocolate, coarsely chopped
• 4 tablespoons unsalted butter
• 1 cup plus 2 tablespoons all-purpose flour
• ½ cup unsweetened cocoa powder, preferably Dutch process
• ¾ teaspoon baking powder
• ½ teaspoon instant espresso powder
• ¼ teaspoon baking soda
• 3 large eggs, room temperature
• 1¼ cups (packed) dark brown sugar
• 2 teaspoons vanilla extract
• 1 teaspoon kosher salt
• 3 ounces semisweet chocolate, coarsely chopped
• ¼ cup heavy cream
• 1 tablespoon light corn syrup
• ¼ teaspoon kosher salt
• ½ cup powdered sugar
• 1 teaspoon vanilla extract
• 4 tablespoons unsalted butter, room temperature, cut into pieces

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