| 1/2 cup butter or margarine, softened |
| 1 cup (8 ounces) sour cream |
| 1 teaspoon vanilla extract |
| 2 medium ripe bananas, mashed (about 1 cup) |
| 1 package (8 ounces) cream cheese, softened |
| 1/2 cup butter or margarine, softened |
| 2 teaspoons vanilla extract |
| 3 3/4 to 4 cups confectioners' sugar |