Nutella pirang

Bahan-bahan (24 porsi)

• 1 cup melted unsalted butter
• 1 cup packed light brown sugar
• ¾ cup granulated sugar
• 2 large eggs
• 1 egg yolk
• 1 ½ teaspoon vanilla extract
• 2 ½ cups all-purpose flour
• 2 teaspoons cornstarch
• ½ teaspoon baking powder
• 1 teaspoon salt
• ½ cup Nutella