Lemon Berry Muffins

I modified this recipe for a Lemon Blueberry Yogurt Loaf by substituting mixed berries (raspberries, blueberries, strawberries, and blackberries).  Also, instead of making one big loaf I made a dozen muffins.  It was so delicious, but very very rich!  My husband (who has a sweet tooth like none other) actually could not even finish his.