I picked up an opera cake from Rahier and it wasn't as rich-tasting as I have had in Europe, though it was alright. It wasn't my first choice of cake but most of the others were all sold out by the time I got there. I didn't want any tartes or anything mousse-y so this left few options. Jennifer (the lady with the French accent) was also gone by then and I ended up being served by this snooty little woman who could care less about being altogether pleasant!
They have their usual array of 80's-looking mini cakes and other baked goods as well as their patio out front which does not remind me of a sidewalk cafe in France but moreso a front deck with lots of traffic and noise that surrounds.
Rahier's website is a little outdated but they do have a seasonal menu for cakes, cookies, tartes, bread, often highlighting whatever is in season (ie, berry tarts for summer, etc) and other cafe bites such as quiches and sandwiches. They also sell ice cream!
NOTE: they are one of very few places (that I know of) in Toronto to offer croquembouches, which in simple terms is a cone-chaped tower of cream puffs that is often served at certain special occasions. I can't comment on whether theirs is good or not but I see nothing wrong with a stack of cream puffs glazed in caramel~