When I had my Bailey, we used to experiment with what he WOULDN'T eat since that list was so much shorter. He loved pizza, sourkraut, olives, ice cream, pork-n-beans (a lot of my cats liked these). He also loved cereal, the sugary kind.
My girl Autumn is an extremely picky eater and only likes chicken flavored cat food. Not chicken and anything else, just chicken. She detests anything fish flavored, including tuna straight out of the can (wierdo). But she ADORES ham and bacon. We keep a jar of bacon bits in the fridge and give her a bite now and then as a treat.
Then there's Louie. We have determined that louie is somewhat of an addict. He had problems with diarrhea as a kitten and the vet said that was common and gave him a tube of Probiacin paste. He hated it at first, so we had to smear it on his face to get him to take it. After awhile, he not only got used to the taste, he decided it it was the best thing ever. The vet said it wouldn't hurt him as an adult, so we occasionally buy tubes of it as a treat for him. He knows we keep it in the fridge, and any time we go into the kitchen, Louie runs to the fridge and cries for what we call his Diarrhea Paste.