Muffins – 2 cups flour – 3 teaspoon baking powder – ½ teaspoon salt – 2 cups sugar – 2 teaspoons ground cinnamon – 1 large egg – 2 cups cold mashed sweet potatoes with or without added butter or milk – 1 cup canola oil Streusel – 6 Tablespoons All Purpose Flour – 6 Tablespoons Brown Sugar – 1 teaspoon Cinnamon – 2 Tablespoons Shortening or butter Glaze – 1 cup powdered sugar – 2 tablespoons milk or water – ½ teaspoon ground cinnamon