At the Royal Anandapur (Joffrey's) Tea Cart in AK they have an really good apple fritter that is a decent size for a snack credit. They also have danish and donuts which I haven't tried. There is one other Joffrey's cart at the entrance to AK and there are 2 Joffrey's carts in HS- one in Pixar Place and one by TOT. They should all have similar snacks.
Now that Yak and Yeti has a quick serve breakfast you can get the hashbrown bites as a snack credit. Creature Comforts (Starbucks) has danish, hardboiled eggs (sometimes), bagels, muffins, smoothies and fruit as snack credits