BTW I use coconut oil instead of the butter because I am on a journey toward going vegan. It adds a very mild coconut flavor to the muffin.
I also tried substituting the butter with a couple teaspoons pumpkin and used pumpkin pie spice instead of cinnamon; it was delicious! I had to cook it for 45 additional seconds because it was too mushy int he middle after only 1 minute.
I made another tonight; I substituted sour cream for the butter and I used stevia for the sweetener. It was not sweet enough so I put a dollop of sour cream on top with a packet of splenda sprinkled over it. OMG it was HEAVEN!
185/131/120 ~ 5'2"