Lily hasn't had too many treats to try so far, since I've been switching her over to cat food, but she seems to like the two kinds of food she's on right now (Wellness Indoor and Spike's Premium), and she really likes plain cooked chicken and turkey.
Mealies, lots of mealies. My hedgie would climb on top of the mealie container, trying to get at them. If I let him, he'd dig through the bran and eat all the mealies :lol: So I have to limit him to 3 each time ^_^ And even then, usually when I've done something to make him huff and hiss (like nail cutting, or moving around positions on the couch).
And eggs. He seems to prefer hard boiled over scrambled though. With the scrambled, it takes him longer to finish, but the hard boiled, he'll eat it all quick. Egg white and yolk are all the same to him, totally ignores the strawberries I have with the eggs and just goes for the eggs. He'll only eat the strawberries later on, when he's feeling the munchies again and there's no more eggs.