Blueberry Whoopie Pies Whipped Blueberry Filling – Fresh homemade baked blueberry whoopie pies. These delicious cakes are filled with fresh blueberries and stuffed with a whipped blueberry filling. Summer’s best. Old fashioned blueberry whoopie pies with blueberry whipped filling. These delicious cakes are just like the treats we find by the Amish. But now you…