* I used regular pantry peanut butter for my muffins (Skippy, to be exact :) I haven’t tested these with natural peanut butter, though I suspect it would work just fine. Let me know if you try it! As for the bananas, the more ripe they are, the better the flavour!
** While you could use regular chocolate chips in these muffins, I highly recommend picking up some chocolate chunks. The generous pieces of chocolate are a big part of the appeal of these muffins (together with the banana and peanut butter).