If you have an old one then I believe that used a 100 watt light bulb for heat. Now banned.
My son wanted one when he was four to make cookies. He learned a real oven an seven.
He can cook anything, but generally he cooks the meat and the wife cooks the rest.
I thought it was just stainless steel or yellow, some neutral color. Cannot recall now.
He would not have cared. What four year old does?