1/2 cup (1 stick) unsalted butter, room temperature |
3 tablespoons (packed) golden brown sugar |
1 tablespoon mild-flavored (light) molasses |
1/2 teaspoon ground ginger |
1/4 teaspoon ground cinnamon |
pinch of ground cloves |
3 tablespoons minced crystallized ginger |
6 8-ounce yams (red-skinned sweet potatoes), rinsed, patted dry |