99 % of the time you provide your own platter, tray or whatever. The presentations can get a bit elaborate. It's fun for me to watch the creativity that I don't have.
I also see that desserts are included in anything but. Sometimes they are not allowed or they have their own category. This does mean that anything but can be cooked on anything..oven, microwave, propane, smoker, etc. as desserts are usually prepared in the ovens in the motorhomes.