Question: what is the best temperature to keep food warm in the oven?
Answer: If you're preparing several foods that get "done" at different times, you often can successfully hold most hot foods for about 15 to 20 minutes in a preheated oven set to 200 to 250°F. For longer than this, check frequently with a food thermometer, to assure the food is remaining at a temperatures of 140°F or above.