Nothing like good ol’ meat and Idaho potatoes to satisfy a hungry bunch! The two can be readily combined, either in a combined dish – or separately as you describe. Typically, a 400°F oven will bake a potato in about an hour. As for combining in a 325°F oven, the potatoes will still bake up fine – just allow more time for the potatoes to cook. Any way you choose, baked potatoes will be done when a fork pierces the potato easily and the interior flesh reaches 210°F.