For the Bars: 1 1/2 cups all-purpose flour |
| 1/2 cup confectioners' sugar |
| 1 teaspoon grated lemon peel |
| 1 teaspoon grated orange peel |
| 3/4 cup cold butter or margarine |
| 1/4 cup all-purpose flour |
| 2 teaspoons grated lemon peel |
| 2 teaspoons grated orange peel |
| 2 cups (16 ounces) sour cream |
| 1/2 teaspoon vanilla extract |