Samosas are good, as well as the other snacks at Mr. Kamal's. I don't know if it's open all the time though.
Chicken fried rice at Yak & Yeti is a snack, and is enough for lunch (we usually get an order of honey chicken, plus this, and share between DD and me, and are so full). One egg roll is also a snack credit.
Onion rings at Flame Tree are a snack credit.