mouse snacks🐭

does anyone know some good snacks for fancy mice? i know fruits and vegetables, but any specific kind? is it subjective to each mouse? i’m really just looking for the tastiest and healthiest treats for my little girls. i only got them a few days ago and i want them to be comfortable in their new home. i know not to feed them anything other than their mouse food over three days a week, and i know it needs to be in small portions. i gave them a little bit of peaches today and they seemed to love it! the same with lettuce yesterday. one more time this week before it goes onto a fixed schedule of every sunday, wednesday, and friday, and i want to make it count, especially since that’s the treat i’ll probably be using to get them used to having me in their habitat. any help is appreciated!