The perfect blend of rich creamy butter and pure peppermint oil. Enjoy the decadent taste of melt in your mouth goodness. If Richardson Butter Mints contain real butter, how can they be fat free? Richardson Butter Mints contain what FDA guidelines consider a dietary insignificant amount of fat. Butter mints actually contain 0.78 grams of fat per serving. However FDA guidelines consider any product with less than 1 gram of fat per serving to be fat free.