I am IN LOVE with this place!
The Cups at Glen Cameron Road is located right next to Piggy's Restaurant (a favorite of mine for Korean BBQ). It can get really crowded after dinner time and you often have to wait for a table. Luckily they can accomodate take-out desserts in a cup, but I just feel it's more satisfying to eat dessert out of a bowl instead.
Most definitely try their shaved ice (Bing-su), which is made out of finely shaved milk - it's like a soft powder, but sweet! The soybean (injeolmi) flavor shaved ice is my favorite, and their strawberry one is a very close second.
There is a second location at Yonge/Finch area as well.