Chocolate Chipless Cookies

Bahan-bahan (6 porsi)

• 1/2 cup unsalted butter, softened to room temperature
• 1/2 cup packed light brown sugar
• 1/3 cup white granulated sugar
• 1 egg
• 2 teaspoons vanilla extract
• 1 1/2 cups all-purpose flour
• 2 teaspoons cornstarch
• 1 teaspoon baking soda
• 1/2 teaspoon fine sea salt
• flaky sea salt