Green Bean Mushroom Casserole

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For the Casserole:

2 tablespoons unsalted butter

1 white onion, diced

4 ounces cremini mushrooms, sliced 

4 ounces shiitake mushrooms, stemmed and sliced

2 tablespoons all-purpose flour 

2 cups low-sodium chicken or vegetable broth

1/2 cup half-and-half

Kosher salt

1 1/2 pounds green beans, trimmed and halved 

Freshly ground pepper

For the Topping:

1 white onion, halved and thinly sliced

1 cup buttermilk

2 cups all-purpose flour

Kosher salt

Vegetable oil, for frying