When I’m cooking for a crowd I like to fill up a sheet pan with a potato option like sweet potatoes and a vegetable option like brussel sprouts and just roast them all in the oven together. This is an easy way to make a lot of food all at once. Cover the sheetpan with foil, fill up the pan with your vegetables, pop them in the oven and you are all set.
Your house will smell amazing and you can always add your meat dish on another rack in the oven. You can use white or sweet potatoes, some onions, and any vegetable that you think will hold up to some heat, like the brussel sprouts. These potatoes and vegetables will brown and get slightly crispy. Watch them closely after 45 minutes to cook them to the degree of doneness that your family enjoys them.