Apparently these are all over Pinterest. I am not all over Pinterest, because if I go down that rabbit hole, I am never ever coming out. You might use Nutella to make these, but if you are feeling slightly horrified by the sugar content of Nutella and happen to have a nice natural foods store or Whole Foods nearby, you can find a “healthier” hazelnut-chocolate spread that works well. (Let’s just pretend it is healthier. I’m not sure how over 30% hazelnut and 20% cocoa powder can be healthy, but let’s not worry about it.)
I used this recipe: http://www.krissys-creations.com/2012/05/nutella-muffin-cakes.html
The only change to the recipe I’d recommend is giving your chocolate-hazelnut spread a good mix with a spoon or fork before adding it to the muffin tins. It’s much easier to swirl after it’s been whipped up a little bit. These aren’t really cakes, but are a bit too sweet to be muffins. I don’t know what they are, exactly, but they feel more like a breakfast or brunch food than an after-dinner treat. Have fun and enjoy!