1 cup cold mashed sweet potatoes (prepared without milk and butter)
3 teaspoon grated orange peel
2 eggs, lightly beaten
1 1/2 teaspoon baking powder
1 teaspoon ground ginger
1/4 teaspoon baking soda
1/4 teaspoon ground cinnamon
1/4 teaspoon salt
1 cup plus 1 tablespoon sugar, divided
1/2 cup butter, softened
2 tablespoon finely chopped crystallized ginger
Directions
In a large bowl, combine the flour, 1 cup sugar, orange peel, baking powder, ginger, salt, and baking soda. In a small bowl, combine eggs and sweet potatoes; stir into dry ingredients just until moistened.
Fill greased or paper-lined muffin cups two-thirds full. Combine cinnamon and remaining sugar; sprinkle over batter.
Bake at 400 degrees for 16-20 minutes or until a toothpick inserted near the center comes out clean. Cool for 5 minutes before removing from pans to wire racks.
In a small bowl, combine the ginger butter ingredients. Serve with warm muffins.