Salted Crinkle Top Brownie Cookie Bars

Bahan-bahan (16 porsi)

• 1 stick (1/2 cup) salted butter, at room temperature
• 1/3 cup dark brown sugar
• 2 tablespoons granulated sugar
• 1 large egg, at room temperature
• 1 teaspoon vanilla extract
• 1 cup + 2 tablespoons all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 3/4 cup semi-sweet chocolate chips
• 1 cup Nutella
• 2 large eggs
• 4 tablespoons salted butter, melted
• 2 teaspoons pure vanilla extract
• 1/2 cup all-purpose flour
• 1/2 cup semi-sweet chocolate chunks ((optional))
• flaky sea salt