These chocolate courgette muffins are super chocolate-y and incredibly delicious. You would never know there is a hidden vegetable in there, and the passion fruit frosting is just so decadent and takes this muffin to a whole different level. You could omit the frosting from some of them for a grab-n-go breakfast, and use the frosting when you want it to be more of a dessert. Up to you, frosting with breakfast would work too!