Peppermint Sugar Scrub Cubes Recipe with Printable Label Add drops of peppermint oil and color (optional) into Vitamin E oil and mix well. 2. Microwave shea butter soap base for 30 - 40 seconds or until melted, stirring every 10 seconds. Pour Vitamin E Oil mixture into soap base and mix well. 3. Have your mold close at hand and add sugar into soap/oil mixture.