What do you get when you cross a doughnut and a muffin? A Duffin of course. This delicious fusion of baked treats is exactly what you need to make today. To add to the sheer indulgence that is the Duffin, we filled ours with Nutella but if jam is more your, well jam, then feel free to substitute it for the Nutella. And if you prefer your Duffins without filling, that’s ok too.