I have made this recipe several times. I use real butter. FYI Splenda has been known to have bad effects. My son-in-law used it and got a headache every day. He discontinued use, and no more headaches. I would recommend Stevia instead of Splenda, or just use plain sugar. Beet sugar also is better to use, but it is hard to find. Sometimes Wal-Mart sugar is beet sugar. If it doesn't say cane sugar, it probably is beet sugar.