Perfect Chocolate Chip Cookies | America's Test Kitchen

Ingredients

• 1 3/4 cups unbleached all-purpose flour (8 3/4 ounces/248 grams)
• 1/2 teaspoon baking soda
• 14 tablespoons unsalted butter (1 3/4 sticks)
• 1/2 cup granulated sugar (3 1/2 ounces/99 grams)
• 3/4 cups packed dark brown sugar (5 1/4 ounces/149 grams) (see note)
• 1 teaspoon table salt
• 2 teaspoons vanilla extract
• 1 large egg
• 1 large egg yolk
• 1 1/4 cups semisweet chocolate chips or chunks (see note)
• 3/4 cup chopped pecans or walnuts, toasted (optional)