Quaker's Best Oatmeal Cookies

1 1/4 cups butter or margarine, softened
3/4 cup firmly packed brown sugar
1/2 cup granulated sugar
1 egg
1 teaspoon vanilla extract
1 1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon ground cinnamon
1/2 teaspoon salt
1/4 teaspoon ground nutmeg
3 cups Quaker