Sugar-free and flourless banana muffins

Ingredients:

16cm cast iron skillet 2 muffins amount

Two bananas (just one for muffins), two eggs, two spoons of oat bran, a small piece of butter (depends on the pan ~ can not be put), a small piece of dark chocolate

Method:

1, a banana into a paste Put to the muffin, and then rub a piece of dark chocolate can be (or sprinkle cocoa powder, etc.)!