The Best Soft and Chewy Chocolate Chip Cookies: 3/4 cup unsalted butter, softened (1 1/2 sticks), 3/4 cup light brown sugar, 1/4 cup granulated sugar, 1 large egg, 1 teaspoon vanilla extract, 2 cups all-purpose flour, one 3.5-ounce packet instant vanilla pudding mix (not sugar-free and not 'cook & serve'), 1 teaspoon baking soda, one-12 ounce bag (2 cups) semi-sweet chocolate chips