I have come to realise that I am ever so slightly obsessed with breakfast foods, especially slightly naughty ones and these Fudge Studded Mocha Muffins fit that bill perfectly.
I found a recipe for low fat Mocha Chocolate Chip Muffins, and in a fit of I'm still not sure what, I turned them into Espresso Muffins with Peanut Butter Chips, and they are full of dark espresso cakey goodness.