Layers of Love Chocolate Chip Cookies | Flavor and Friends

Ingredients

• 1 cup unsalted butter room temperature
• ¾ cup granulated sugar
• ¾ cup packed brown sugar
• 4 large egg yolks at room temperature
• 1 large egg, lightly beaten, for brushing
• 1 teaspoon pure vanilla extract
• 2¼ cup all-purpose flour plus more for dusting
• ¾ teaspoon baking soda
• ½ teaspoon kosher salt
• 9 ounces semisweet chocolate
• ¼ teaspoon fleur de sel