Yes, you can prep green bean casserole the night before, and many recipes even allow up to 1–2 days in advance as long as it is kept refrigerated and covered tightly.

How to Prep Ahead

• Assemble the casserole (green beans, sauce, seasonings) in a baking dish, then cover well with foil or a lid and refrigerate overnight.

• Leave off the crispy topping (like French fried onions, panko, or crackers) until just before or during baking so it stays crunchy instead of getting soggy.

Baking The Next Day

• Take the casserole out of the fridge and let it sit at room temperature for about 30–45 minutes before baking so it heats more evenly.

• Bake according to your recipe, adding the fried onions or other crunchy topping for the last several minutes of baking to crisp and brown them.

Safety And Quality Tips

• Keep the assembled casserole tightly covered and refrigerated; do not freeze it, as the sauce can separate and the texture can become watery and mushy.

• If you assemble more than 24 hours ahead, most sources recommend a maximum of about 48 hours for best texture and food safety, still keeping the topping separate until baking.