Original recipe from allrecipes.com: http://allrecipes.com/Recipe/Whole-Wheat-Sweet-Potato-Muffins/
Yield: 16 muffins

Ingredients:
1 sweet potato
2 cups whole wheat flour
1 teaspoon baking soda
½ teaspoon salt
1 teaspoon ground cinnamon
¼ teaspoon ground nutmeg
¼ teaspoon ground ginger
¼ teaspoon ground clove
¼ cup vegetable oil
2 eggs, lightly beaten
1 teaspoon vanilla extract
1 cup honey
1 (6 ounce) container vanilla yogurt
½ cup oatmeal
½ cup brown sugar
½ cup almonds
1 teaspoon cinnamon

Directions:

1. Preheat an oven to 400 degrees F (200 degrees C). Grease 16 muffin cups, or line with paper muffin liners; set aside. Prick sweet potato several times with a fork and place onto a baking sheet.
2. Bake the sweet potato in the preheated oven until easily pierced with a fork, about 40 minutes. When the potato is cool enough to handle, peel and mash.
3. Reduce the oven temperature to 350 degrees F.
4. Whisk together the flour, baking soda, salt, the one teaspoon cinnamon, nutmeg, ginger, and cloves. Stir in the vegetable oil, eggs, vanilla, honey, yogurt, and mashed sweet potato, just until all ingredients are moistened. Spoon batter evenly into prepared muffin cups.
5. Blend together the oatmeal, brown sugar, almonds, and the remaining teaspoon cinnamon in a food processor or blender. Sprinkle topping over unbaked muffins.
6. Bake muffins in the preheated oven until golden and the tops spring back when lightly pressed, 12 to 15 minutes.

Nutrition:
Calories 233 kcal; Carbohydrates 41.1 g; Cholesterol 27 mg; Fat 6.9 g; Fiber 3.1 g; Protein 4.8 g; Sodium 182 mg