The Best Oatmeal Raisin Cookies

Name: The Best Oatmeal Raisin Cookies
Ingredients: 1 cup (2 sticks) unsalted butter , softened, OR 1 cup shortening; 1 cup brown sugar (light or dark), packed; 1/2 cup plus 2 tablespoons ( 10 tablespoons) granulated sugar; 2 large eggs; 1 tablespoon vanilla extract; 1 1/2 cups all-purpose flour; 1/2 teaspoon salt; 1 teaspoon baking soda; 1 teaspoon ground cinnamon; 1/2 teaspoon freshly grated nutmeg; 1 1/2 cups raisins; 1/2 cup chopped walnuts, optional; 3 cups rolled oats (old-fashioned or quick; do NOT use instant)