Mr. Chu is a nice, inexpensive snack that hits the spot - just under $5! It's a food truck located just west of Finch and Yonge (on Finch) and it's bright yellow so it's easy to find.
A Korean friend told me that the difference between regular churros and Korean ones is that they use glutinous rice flour - to be honest I didn't taste much difference so not sure how much they use? But this was delicious anyway! It comes out piping hot as it is freshly made and is a little difficult to hold because it's so tall. I got Nutella with sprinkles but you can get it with condensed milk, oreo, and almonds as well. You can also get it with ice cream (which I will try next time) but it was delicious in and of itself as well.
The guys who work there were also super friendly and helpful while explaining how the ordering process worked. I'll definitely have this again when I'm in the area!