I already had this place bookmarked before arriving at Montreal and it definitely did not disappoint. This Mamie Clafoutis was only a short walk from our hotel on St Denis St. Upon first glance the bakery already looked authentic as the first thing you see is a display window with freshly baked breads for sale. Even better, if you sit upstairs you can see the staff working in the kitchen as they prepare pastries and other things.
In addition to fresh loaves of bread, they sell many pastries and desserts. I tried both the chocolate/pistachio and chocolate/almond croissants. Both were very good, perfectly flaky and not stale at all. While the store seems busy just grab a number and it doesn't take too long to be serviced. Most people buy food to-go so there is plenty of room upstairs to eat your food, enjoy the free wifi, and watch the bakers work.