Great muffins. I reduced the amount of baking powder to a single teaspoon, adding half a teaspoon of cream of tartar - they didn't rise as much as expected but they are moist and flavourful.
These muffins were pretty tasty, but the baking powder taste was too pronounced to give them a higher rating. They rose nicely, so maybe the baking powder could safely be cut back with good results. They were nice & moist & the fruit was just right. It was a good thing that the cinnamon sugar was sprinkled on top, because they did not brown much, but with the topping it didn't matter.