The casserole is the format that wins Thanksgiving. You build it a day or two ahead, it bakes in one dish that goes straight to the table, and it holds on a buffet without falling apart. Every casserole below can be assembled in advance, which is the whole reason to lean on them when you are cooking for a crowd on one oven.

[Photo: three casserole dishes lined up on a counter, foil-covered, labeled with sticky notes]

The core three

Green Bean Casserole

From scratch: fresh beans blanched and shocked, a real browned-mushroom sauce, crisp shallots added at the end. Assemble without the topping 1 to 2 days ahead. The one everyone expects, done well enough that they actually eat it.

Sweet Potato Casserole

Baked sweet potatoes for concentrated flavor, modest added sugar, bound with egg so it sets, topped with pecan streusel or marshmallow. One of the best make-aheads of the whole meal — assemble it 2 days early.

Thanksgiving Mac and Cheese

The baked custard style, set with egg and evaporated milk, so it holds on a buffet for hours without the sauce breaking. Assemble a day ahead, bake on the day.

Worth adding if you have the crowd

• Corn casserole (spoonbread): creamed corn, whole corn, a box of corn muffin mix, sour cream and butter, baked until set and golden. Almost no work, and it is always the first empty dish.
• Broccoli-cheese casserole: blanched broccoli in a sharp cheddar sauce with a buttered cracker top. A green vegetable people will choose.
• Hash brown casserole: shredded potatoes, cheese, sour cream, and a cornflake or cracker crust. Rich, and a crowd favorite at a Southern table.
• Squash casserole: yellow squash and onion baked custard-style with cheese and a crumb top — a lighter option among the heavy ones.

How many casseroles?

Two or three. A green bean casserole, a sweet potato casserole, and one more, mac and cheese or corn, covers the casserole slot on a plate that also has stuffing, a green vegetable, cranberry sauce and rolls. More than three and you are making leftovers nobody asked for, and you run out of oven.

The two-day make-ahead plan

• Two days before: bake the sweet potatoes; blanch the green beans; make any cheese or mushroom sauces. Assemble the sweet potato casserole fully.
• The day before: assemble the green bean casserole (no topping) and the mac and cheese. Everything goes in the fridge, covered and labeled.
• Thanksgiving, while the turkey rests: the oven is empty and hot. Bake all the casseroles together, they mostly want 350 to 375°F, adding 10 to 15 minutes because they are going in cold. Add crisp toppings in the last few minutes.

The full per-person math and the rest of the menu are in our Thanksgiving dinner planning guide, and these dishes sit in the wider lineup in our best Thanksgiving side dishes.

Frequently asked questions

Can Thanksgiving casseroles be made ahead?

Yes, that is their main advantage. Most can be fully assembled 1 to 2 days ahead and baked from cold on the day, adding 10 to 15 minutes. Add any crisp toppings at the end of baking, not before.

How many casseroles should I make for Thanksgiving?

Two or three, alongside a green vegetable, cranberry sauce, stuffing and rolls. More than that creates excess leftovers and an oven traffic jam.

How do I bake several casseroles in one oven?

Assemble them ahead, then bake them together at 350 to 375°F while the roasted turkey rests under foil for 30 to 45 minutes. Most casseroles are happy in that range.

Which casserole holds best on a buffet?

The custard-style mac and cheese and the sweet potato casserole both hold for a couple of hours. Green bean casserole is best eaten within the first hour while the topping is crisp.

The bottom line

Pick two or three casseroles, assemble them a day or two ahead, and bake them together while the turkey rests. The format exists to take pressure off the day, use it.

Save this for the two-day plan, it is the schedule that keeps Thanksgiving calm.