Green Bean Casserole - our style

Actually, I modified this from Alton Brown so I really can't take the credit but here it is (and quite yummy too I might add)

Ingredients
For the topping:
POTATO CHIPS!!!! Trust me ☺
For beans and sauce:
• 2 tablespoons plus 1 teaspoon kosher salt, divided
• 1 pound fresh green beans, rinsed, trimmed and halved
• 2 tablespoons unsalted butter
• 12 ounces mushrooms, trimmed and cut into 1/2-inch pieces
• 1/2 teaspoon freshly ground black pepper
• 2 cloves garlic, minced
• 1/4 teaspoon freshly ground nutmeg
• 2 tablespoons white rice flour
• 1 cup chicken broth (we use organic)
• 1 cup half-and-half (we use whole goat milk)
Directions
Preheat the oven to 475 degrees F.
Bring a gallon of water and 2 tablespoons of salt to a boil in an 8-quart saucepan. Add the beans and blanch for 5 minutes. Drain in a colander and immediately plunge the beans into a large bowl of ice water to stop the cooking. Drain and set aside.
Melt the butter in a 12-inch cast iron skillet set over medium-high heat. Add the mushrooms, 1 teaspoon salt and pepper and cook, stirring occasionally, until the mushrooms begin to give up some of their liquid, approximately 4 to 5 minutes. Add the garlic and nutmeg and continue to cook for another 1 to 2 minutes. Sprinkle the flour over the mixture and stir to combine. Cook for 1 minute. Add the broth and simmer for 1 minute. Decrease the heat to medium-low and add the half-and-half. Cook until the mixture thickens, stirring occasionally, approximately 6 to 8 minutes.
Remove from the heat and stir in all of the green beans. Top with the remaining potato chips. Place into the oven and bake until bubbly, approximately 15 minutes.