Makes 12
| 1 | small sweet potato (about 8 ounces) |
| 1 | cup walnuts |
| Butter (for the pan) | |
| 1 | cup all-purpose flour |
| 1 | cup whole-wheat flour |
| 1 | tablespoon baking powder |
| ½ | teaspoon baking soda |
| ½ | teaspoon salt |
| 1 | teaspoon cinnamon |
| ⅛ | teaspoon ground cloves |
| ¼ | cup sugar |
| Grated rind of ½ orange | |
| 2 | eggs |
| ¾ | cup plain yogurt |
| ¼ | cup vegetable oil |
| ½ | cup honey |
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