The Mickey ice creams are always a hit with our kids, one likes the bar and one likes the sandwich. We ate a lot of Mickey pretzels too, though the ones we had at HS were old and hard (this was early in the morning so I wonder if they were from yesterday) but we will sometimes grab a churro and a pretzel for "breakfast" once we get to the parks.
We also love the funnel cake in HS right by Indiana Jones, it's one snack credit and you can get it with strawberries and ice cream. A great treat to share.
We always end up with too many credits left over so get some good stuff from Goofy's candy shop in Disney springs. We usually end up getting some of the cake pops, chocolate covered krispy treats, or the chocolate covered marshmallows. All are snack credits.