If you prepped ahead and baked it, reheating is easy. Pop it in a 350°F oven for 15 minutes, uncovered. The top will crisp back up. Never, ever microwave it. The microwave turns the beans into sad, limp green ghosts. Not fun.
Can You Make Green Bean Casserole Ahead Of Time?
The “Oops, I Burned the Onions” Fix
It happens. You get distracted. The fried onions turn dark brown. Don’t panic. Just toss them out and open a new can of fried onions. That’s why you always buy two cans. One for the casserole, one for the “I burned it” emergency. You are now a pro.