Using your food processor, grate the soap bars, if you want a finer texture you will have to tip out the grated soap into a bowl and put the blade into the processor, put the soap back in the processor, and grind the soap.
Put the soap into a glass mixing bowl and add the chocolate, cinnamon and oil, mix well.
Now add the essential oil and mix again.
Heat the water in the microwave for 40 seconds on high, add this to the soap and mix with a fork or spoon, then knead with your hands until you have a pliable dough.
Divide this mixture in 4 or 6 portions, roll them into a ball, and then flatten the bottom slightly, holding the ball in the palm of your hand and pushing it down gently on a flat surface, Put them on a piece of baking paper, they will need to dry for a few days, at least 2 to 3 days, in a warm airy space.
When ready put them in a muffin cup, dust with cacao powder or baking soda if you want, wrap the soap in clear plastic wrap.