This recipe can be found in the cookbook Bite Me by Julie Albert and Lisa Gnat. The recipe is also on their website. I made these muffins last night, with a couple of substitutions. I used raspberries instead of blueberries. I didn’t have quite enough sour cream, so I added about 1/4 cup orange juice. The muffins turned out great! I love the raspberry flavour, and the crumble topping is a nice added touch. Yum!