1/4 cup butter or margarine, softened
1/2 cup sugar
1 egg
1 cup all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon ground cinnamon
1/4 teaspoon ground ginger
1/4 teaspoon salt
1/2 cup cold mashed sweet potatoes
2 tablespoons milk
1/4 cup raisins