I use my portable grill as an oven to cook cornbread and blueberry muffins but found that it burned the bottom of the cornbread and muffins. I made a heat shield that fits to and hangs from the grill grate. This should help stop the burning by deflecting the heat.
@Mr. T - Killer. I like that. I assume you use it on the go and at home then. I found an old charcoal SS Boat grill. I have all the fittings to turn it into a propane version with a little modification. That radiant plate looks better and better the more I ponder it.