Hah, an age old dilemma! I learned from Teri Gelter, daughter-in-law Courtney’s mom, to cook items that keep the heat in first, like pasta, potatoes, etc. Wrap them in a couple layers of foil (spray the inside of the foil if the food is in a pan so it doesn’t stick to the food), then wrap the whole thing in a couple bath towels. It should stay warm for an hour or so, freeing stove top and oven space.
Baked potatoes can be wrapped in foil and then placed in a cooler lined with a bath towel.