Add chicken in a deep pot, cover chicken with water and boil for 20-25 minutes or until chicken is done.
After chicken is cooked add the Mole sauce and the chocolate bars (1 1/2 bars) together and add the hot chicken stock (if using from the cooked chicken) into a blender, let it cool a bit and blend. Add 2 tablespoons of flour and blend a bit more just pulse it.
Add the mole mixture to a pan or pot on low heat and simmer stirring constantly so it will not burn. Once the Mole sauce has thicken (not to much) turn heat off and add chicken pieces. Cover let it stand for a couple of minutes, serve.
You can accompany this mole wit Mexican rice and a salad!