Chocolate Blackout Cookies

Ingredients

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