Green Bean Casserole (or Hot Dish if you're from Minnesota) is amazing, basically you just need:

4 Cans of green beans
2 small cans of cream of mushroom soup (or cream of chicken)
1 1/2 cups of whole milk
2 cups of crispy fried onions (like French's Fried Onions or knock-offs)

First add the beans and the cream of mushroom soup to a pan, mix them together and slowly add the milk, when that's all set, mix in at least a cup of the fried onions, and make sure it's all mixed well. When you're ready to bake it, toss the rest of the fried onions on top to make a crispy layer of deliciousness. Bake it at 375˚F for 8 to 12 minutes, or just until the onions turn golden brown.

It serves quite a few people, or one hungry person, or one normal person for several days. I usually make this around Thanksgiving, but it's just so good you could make it whenever.