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.
So, turning it into a radiant heat style grill. Be careful with the heat buildup if its a propane setup. Invest in some new O-Rings. I like it though. definitely repost back how it works.