Snickery Squares

INGREDIENTS

• :
• 1 cup all-purpose flour
• ¼ cup granulated sugar
• 2 tablespoons confectioners' sugar
• ¼ teaspoon salt
• 1 stick (8 tablespoons) unsalted butter, cut into small pieces and chilled
• 1 large egg yolk, lightly beaten
• 1/3 cup granulated sugar
• 3 tablespoons water
• 1½ cups salted peanuts
• 1½ cups dulce de leche
• 7 ounces bittersweet chocolate, finely chopped
• ½ stick (4 tablespoons) unsalted butter, cut into 8 pieces, at room temperature