CHEWY OATMEAL RAISIN BARS 3/4 cup firmly packed brown sugar 1/2 cup granulated sugar 4 tablespoons margarine 3/4 cup apple butter* or apple sauce 2 egg whites or 1 egg 2 tablespoons skim milk 2 teaspoons vanilla 1-1/2 cups all-purpose flour 1 teaspoon baking soda 1 teaspoon ground cinnamon 1/2 teaspoon salt (optional) 1/4 teaspoon…