Mix together the first three ingredients, and allow the yeast to proof for about 10 minutes. (I know, lots of people say you don’t have to do this, but I always proof my yeast, that way I’m sure it is alive!)
Mix dry ingredients (flour, sugar, salt, and cocoa) in a large bowl, and make a well in the center. Pour the butter and the yeast mixture into the well, and then combine everything. You can start with a wooden spoon, but eventually you will need to use your hands.
Knead dough for about 10 min. Coat the dough with oil and cover with a tea towel to rise.
Allow to rise until doubled in size.
After the dough has risen, punch it down, and sprinkle chocolate bits evenly over the dough.
Work the chocolate into each piece of dough, shape into circles and place on a baking tray lined with parchment paper . Cover with a tea towel, and allow to rise for another half hour.
Preheat oven to 350 F.
When loaves have risen, bake for about 30 minutes. Watch them! Chocolate burns quickly if left in too long.
Allow to cool before slicing.