1. Combine flour, soda, salt and spices. Set aside.
2. In large mixing bowl, beat together brown sugar, butter, egg whites and vanilla until smooth. Stir in zucchini, carrots and Kellogg's Raisin Bran® cereal. Add dry ingredients; mix thoroughly. Spread evenly into 13 x 9 x 2-inch baking pan coated with cooking spray.
3. Bake at 350° F for 30 minutes or until golden brown. Let cool in pan on wire rack for 15 minutes.
4. To make Lemon Glaze, combine butter, powdered sugar and lemon juice until smooth. Spread evenly over warm bars. Cool completely before serving. Cut into bars. Cover and store in refrigerator.