Cinnamon, raisin & apple muffins (revisited)

This recipe doesn't really seem to work too well. I tried to make six of the muffins yesterday and they were a bit of a failure. The quantities given in the recipe produce a very liquidy not-really-a-dough mixture. I thickened it a bit but then they didn't rise, weren't cooked after the appropriate amount of time and when finally cooked didn't really have the right consistency (stodgy muffins anyone?). All-in-all, probably not one of the best recipes I've tried.