stirring until chocolate has melted and you have a smooth consistency. if the chocolate is slow to melt, put the pan over a low heat and stir until smooth.
transfer to the tin and chill for at least two hours. cut into small squares and arrange on a plate for serving. top rack dishwasher safe.
warning: mugs can get extremely hot when placed in the oven. please use oven gloves when removing them from the oven and allow approximately 20-25 minutes cooling time, or as instructed in the recipe, before serving. 