I found the consistency of the mixture very heavy and thick, not as smooth as I'm used to with other muffin recipe's I've used. So, I added 2 bananas and it seemed to work well but still a little bland for my tastes.
I really enjoyed these! to make it slightly healthier, I did 1 cup of all purpose flour, 1/2 cup of whole wheat flour & 1/4 cup of buckwheat flour. Then I replaced 2 tablespoons of oil with 2 tables of my friends homemade applesauce. Delicious!