Blueberry - Yogurt Muffins

My wonderful neighbor Jack recently gave me a huge gallon sized bag filled with fresh blueberries. I placed them in the freezer and have been making all sorts of goodies with these sweet berries ever since. The kids were craving muffins the other morning (prior to the heatwave) so I found this recipe in "The Complete Cooking Light Cookbook". My daughter helped bake these muffins and she did an