The secret of why these muffins are so so good is yogurt. Last time I made them, I didn’t have any plain yogurt so I used peach one – and it works beautifully. I used canned pineapple and cut it u into small pieces. I am sure that if you have a can of pineapple tidbits, that would work well – just drain it well, because extra juice could make your batter a bit too runny. For oranges, I cut up a whole...