If you are ever craving or ever want to try authentic Thai desserts give Patchmon's Thai desserts a try! They are the closest to being the authentic Thai desserts you will find in Thailand. They have very amazing variety which changes almost every week.
These Thai desserts are not your typical desserts. Almost all of them are steamed and are made from coconut/milk/egg. They are not similar to any other desserts and you certainly cannot find these in any local market.. nothing can beat a freshly homemade Thai dessert and I believe this is the only place in GTA that offers that!
I personally have never been to the store itself (they were kind enough to deliver them to me and both times were during the weekends.) They do not do regular delivery but I think on some days at certain times they may be able to deliver at certain subway stations or somewhere nearby to them. The owners are very friendly and very passionate about what they are doing.
I'm happy to know there is a store that I can rely on if I ever crave Thai desserts ever again :)