How to adjust an oven to accommodate two items with different cook times and temperatures? For dinner this evening we are cooking a roast beef and intend to serve a baked brie appetizer. Unfortunately, we only have one oven. To reach medium rare the roast needs 3 hours at 325&deg; while the brie needs to be cooked at 400&deg; for 20 minutes.

Is there a way to cook both of these items in the oven at the same time? Is it a matter of adjusting the length of time the brie needs to be in the oven?
I would cook the Brie at that same temperature for 30-35 minutes and it should be okay.

Alternatively, you could cook the roast fully, remove it from the oven, tent it with foil and then cook the Brie.  The meat can rest while the Brie is cooking and being eaten.  Prior to slicing the roast, heat up the pan drippings to a sizzling temp and baste to ensure a crispy crust.  But if the appetizer course happens to last for 20-30 minutes, then the roast will have been resting for 40-50 minutes and could lose too much internal heat.