OK, just to be totally honest, I must admit that although I call this a "One-Pot Meal" I serve it with more foods. I served this on Shabbat to my husband and a couple of guests. There were also a nice fresh salad and two other vegetable dishes. But I didn't bother with an additional carbohydrate, and most people would find this enough with either a fresh salad and/or additional vegetable.
Of course, you can always cook this with more potatoes and/or carrots. I actually added another potato before putting it in the oven. Be sure to put the squash, if you use it, inside the chicken, or it will burn, since it cooks more quickly than any of the other ingredients. And vegetables should be cut in large pieces or not at all.
1 whole chicken
a couple of carrots
a large squash or zucchini
a potato or more
paprika, black pepper and whatever you like
I baked it in an old Farberware, stainless steel pot, that had "lost" its handle. I started baking it without a cover, and after about a half an hour, I covered it with aluminum foil. It baked for a couple of hours, high heat. Use whatever heat your oven manufacturer recommends. Probably an hour and a half would have sufficed. It depends on the size of your chicken. This was a small one, which is why not all of the vegetables fit inside.
Everyone enjoyed the meal, and this sure is a good way to utilize an old pot of fantastic quality.