Preheat oven to 350 degrees F. Grease 9-inch-square baking pan.
Combine flour, baking powder and salt in small bowl. Beat sugar, butter, vanilla extract, lime peel and orange peel in large mixer bowl until creamy. Beat in egg. Gradually beat in flour mixture. Stir in morsels. Press into prepared baking pan.
Bake for 18 to 20 minutes or until wooden pick inserted in center comes out clean. Cool completely in pan on wire rack. Spread with Citrus Icing. Sprinkle with sea salt. Cut into bars. Store in covered container in refrigerator.