How to make this baked macaroni and cheese ahead of time?
Prepare the macaroni and cheese as instructed above, keeping the panko or bread crumbs separate until ready to bake. The assembled, unbaked casserole without the topping can be covered and refrigerated for up to 24 hours. When ready to cook, sprinkle the macaroni and cheese with the panko or bread crumbs, cover with buttered aluminum foil, and bake in 400°F (200°C) oven until warm throughout, 20 to 25 minutes. Uncover and continue to bake until the crumbs are crisp, 10 to 20 minutes more.