1 cup butter, softened
2 cups white sugar
2 cups cooked and mashed sweet potatoes
1 teaspoon vanilla extract
4 eggs
3 cups all-purpose flour
2 teaspoons baking powder
1 teaspoon ground cinnamon
1/2 teaspoon baking soda
1/2 teaspoon ground nutmeg
1/4 teaspoon salt
1 cup sifted confectioners’ sugar
5 teaspoons orange juice
2 tablespoons grated orange zest