1 1/4 cups coarsely chopped walnuts |
1 1/4 cups (packed) golden brown sugar |
4 1/2 teaspoons ground cinnamon |
4 1/2 teaspoons unsweetened cocoa powder |
6 tablespoons dried currants |
3 cups cake flour |
1 1/2 teaspoons baking soda |
1 1/2 teaspoons baking powder |
3/4 teaspoon salt |
3/4 cup (1 1/2 sticks) unsalted butter, room temperature |
1 1/2 cups sugar |
3 large eggs |
1 tablespoon vanilla extract |
1 16-ounce container sour cream |
1 cup powdered sugar |
1 tablespoon milk |