Some of my ferrets have liked raisins, cheerios, and, of course, ferretone.
My current fuzzy, Kermit, likes scrambled egg for a snack.  I mix the egg
with about 2 tablespoons of water; scramble it and cook it.  I give him
about 1/3 of it and then refrigerate the remainder for the next two days
treat.  Kermit quite a gourmet and likes cooked carrots, chicken, and
marcaroni and cheese.
[Posted in FML issue 1914]