The recipe calls for raisins. I really don't like raisins baked into things, so I made half of the batter with craisins, and the other half with dried blueberries. The dried blueberries were splendid.
All in all, these muffins were just ok. I would give them a 5 out of 10. However, with a lot of butter added on top I would give them a 6 out of 10.