I have been making the Penzeys recipe since it was published in their Spring 2003 catalog. The recipe as they published it calls for only 1 cup of banana (about 2), 1/2 cup chocolate chips and no pecans. Since this recipe calls for more banana I can see why you would need to add more flour. These are fantastic muffins. I have also poured the batter into a loaf pan with great success. One change that I have made to the original recipe is that I substitue half wheat flour.
These are yummy and super moist! I made just as stated and did not have to add any extra flour. I liked the addition of a little cinnamon in this recipe as opposed to none in other banana chocolate chip muffins I've made, it was nice for a little change. I left out the pecans as I did not have any, plus my little ones are not quite yet partial to nuts in their baked goods. I only made 12 muffins with this batter and maybe could have stretched it out to get a few more but I don't think I would have gotten near 2 dozen. These do taste great Toby, and I will make again. I hope you like the picture, it was my first try!:)