Mixed Berry Whole Wheat Muffins

I added a blackberry on top of these before baking. These were amazing and I love the idea of making a strawberry puree to put in the mixture. I love using fresh berries in muffins and can't wait to make these again once I can pick up more berries at the Farmers Market. Here's the link to the recipe
http://www.skinnytaste.com/2011/08/mixed-berry-whole-wheat-muffins.html?m=0