2 1/4 cups cake flour |
1 1/4 teaspoons baking powder |
1/2 teaspoon salt |
1/2 cup butter, at room temperature |
1 cup granulated sugar |
1/2 cup light brown sugar, firmly packed |
2 eggs |
1/2 teaspoon grated lemon zest |
1 cup mashed very ripe banana |
1 teaspoon vanilla extract |
1/4 cup milk |
3/4 cup chopped walnuts |
1/2 cup butter, at room temperature (1 stick) |
4 1/2 cups confectioners' sugar |
3/4 teaspoon grated lemon zest |
3 -5 tablespoons fresh lemon juice |