I've been using this recipe that I found on one of the threads here:
(makes 12 muffins, 3 per day on cruise)
8 tablespoons oat bran
4 tablespoons wheat bran (or sub oat bran)
3 eggs, separated
1 tub (250g) quark or fromage frais
1 teaspoon baking powder
pinch salt
5-6 tablespoons sweetener (if making sweet)
flavouring/essence of your choice
Beat whites until stiff, mix all the other ingredients in a bowl then fold in whites and spoon into 12-muffin silicone tray and bake on 190C about 20-25 mins.
I've not had a bad batch yet, and they are actually quite yummy!