My favorite gluten free blueberry muffin is from Mariposa bakery. I couldn’t pass one up when I visited their flagship bakeshop in Oakland for the first time (I typically go to the SF Ferry Building). Their bakery smelled heavenly. The last 30 mins they are open everything is 20% off.
The blueberry muffin has a brown sugar crumb topping which reminds me of my homemade blueberry muffin topping. Not only is the topping crumble but the inside falls apart in your hand – this is not meant to be eaten with a fork. The inside is moist, not grainy and delicate. By the looks of it they use fresh blueberries instead of frozen because the dough is not a blue color.
The only thing differing from my homemade blueberry muffins is that I tend to put more blueberries in my muffins =)