I have been searching for a double chocolate muffin recipe that matches those bought in shops and cafes. The ones I buy are always light as air with a squidgy gooey chocolatey middle and rise to double the height of the muffin paper case. How do they do this?? Has anyone got a recipe that matches the description of the above muffin please? All the recipes I've tried so far come out just like ordinary cup cakes and are cooked right through when I adhere to the recipe times given.