Apple Oatmeal Bars

Heat oven to 375°F (190°C). Grease a 9-inch square baking pan. In large bowl with electric mixer, beat brown sugar and butter until creamy. Add eggs; beat until light and fluffy. Combine both flours, the cinnamon, baking powder, baking soda, and salt; stir into butter mixture until blended. Stir in apples, oats, and nuts. Spread mixture in pan and bake 25 to 30 minutes or until wooden pick inserted in center comes out clean. Cool completely. If desired, top with icing and garnish with nuts before cutting into bars.