A co-worker gave me this recipe, but I believe the original came from a lady named Joanne Chang who operates a bakery. This batter is very versatile in that you can make whatever type of muffins you like. So far I made this recipe and peach muffins. For peach muffins use 1 tsp cinnamon, 1/2 tsp almond extract, one 1 Pound bag of frozen peaches and sprinkle top of batter with brown sugar before baking. This recipe produces a not-too sweet muffin that is light and tender. I think the blackberries are my favorite and DH can't decide between these and my raspberry muffins. You can't go wrong with either one and you can certainly use any combination of your favorite fruit and flavorings. You can certainly use fresh fruit if available.