I actually have made treats that way for my cats except I throw it into the blender with a little catnip and then put it into those little molds for mints and freeze them. They pop right out and then I store them in a plastic tupperware container. I have put them on the plastic sheets used for fruit leather in a dehydrater.
Another one that wasn't listed that my entire gang just loves is sold as dog treats at Wal-mart under the brand name Waggin Train. It comes in either chicken or duck but it is freeze dried jerky, since they are made for dogs they are fairly large pieces, so I take kitchen shears and snip them into bite size pieces and store those in a plastic container. Both work great and I've never seen them raise Max's BGs. On the dog treats I get 22oz for $10, which makes a ton of kitty size treats.
Mel,Max & The Fur Gang