That rig should have come with an instruction book on the oven. It is probably a combination microwave/convection oven. In convection mode, you can use metal pans, but not in microwave mode. It'll take some learning how to use it, but they are great cooking devices.
Hey, a suggestion for a main dish to be made in that oven: cut a butternut or acorn squash in half lengthwise -- stem to flower end, remove the seeds, drop in a dollop of butter or margarine, a spoonful of brown sugar, and bake in a baking dish or pie pan at 375 until tender, maybe 40 minutes. Eat with a spoon or fork, 1/2 squash per person. Almost as sinful as eating desert for the main course.
