I made these with just cocoa powder, but I wanted more impact so I added black cocoa as well.

Generally, you check to see if things are done by sticking in a toothpick, but the melted chocolate will stick to the toothpick even when they're baked, so check by looking at the dough or the chocolate.
The amount of water needed may different depending on the pancake mix you sue. So adjust the amount of the milk accordingly. Recipe by Bu-nyanm