Brown Sugar Blueberry Muffins

So my BFF (Julie, you rock!) sent me this recipe for blueberry muffins that she found at Karina's Kitchen a few months ago (see the original recipe here). Julie's kids have so many food allergies it makes my head spin. She made a couple of modifications to suit her family and said the muffins were fabulous. Well I had a whole pint of blueberries kicking around the other day so I thought I'd