Clementine muffins

The first foray into baking after the Christmas feeding frenzy.  These are low sugar, and are made with yogurt, so not too naughty, but give a bit of a sweet(ish) treat.  More or less from here:-
http://frenchfood.about.com/od/breadandpastry/r/Clementine-Muffins-Recipe.htm - but I didn't put sugar on the top - to save a few extra cals.