I usually give snack treats but occasionally a little bit of training treats are used. I would use treats that I don't often get for my girl to train her as she'll be more inclined to listen for something she doesn't always get (and whine more lol)
Otherwise her snacks can range from lettuce, carrots, boiled chicken, some fresh cooked rice (cooled to body temp of course

..), strawberries, and sometimes I cook/make their treats.
On a very few occasions, it'll be a little dab of junkie/guilty pleasure food, like a few licks of icecream (like vanilla or a popsicle), a dab of whip cream from the can, or a fortune cookie (sans the fortune lol).
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R.I.P. Mick & Mandy (before 2010), Mila - 4/3/15, Chloe - 2/18/16, Kimchi - 6/2/2021