Can you use french style green beans for bean casserole?

No, French style green beans should not be used in a bean casserole.

Green bean casserole is typically made with fresh or canned green beans, such as haricot vert or Blue Lake green beans. French style green beans are a variety of green beans that are cut into thin strips and then cooked in a flavorful sauce. They are typically served as a side dish and are not suitable for use in a casserole.