Can mice eat bell peppers if you have some spare when you’re preparing food? Yes, there are no risks with them eating peppers, and you’ll probably find the love it.
Do not give them the seeds however, these are bad for mice.
I’m not sure which colour peppers they prefer, it probably comes down to individual preferences. Although, I imagine your mice will eat any and all colours of pepper.
I always have the red bell peppers and cut some small pieces off for my little ones. They seem to enjoy the stalks more than the body of the pepper, but none goes to waste.
You can find a more complete list of foods to feed pet mice here.