Green Bean Cassaroles

For the topping:
• 2 medium onions, thinly sliced
• 1/4 cup all-purpose flour
• 2 tablespoons panko bread crumbs
• 1 teaspoon kosher salt
• Nonstick cooking spray

For beans and sauce:
• 2 tablespoons plus 1 teaspoon kosher salt, divided
• 1 pound fresh green beans, rinsed, trimmed and halved (i just used the frozen organic beans from costco that I always have in my freezer)
• 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 (i didn't have freshly ground nutmeg, so I just used the ground nutmeg)
• 2 tablespoons all-purpose flour
• 1 cup chicken broth
• 1 cup half-and-half

Preheat the oven to 475 degrees F.
Combine the onions, flour, panko and salt in a large mixing bowl and toss to combine. Coat a sheet pan with nonstick cooking spray and evenly spread the onions on the pan. Place the pan on the middle rack of the oven and bake until golden brown, approximately 30 minutes. Toss the onions 2 to 3 times during cooking. Once done, remove from the oven and set aside until ready to use. Turn the oven down to 400 degrees F.
While the onions are cooking, prepare the beans. Bring some water and 2 tablespoons of salt to a boil in an pot. Add the beans and blanch. Drain and set aside.
Melt the butter in a cast iron skillet (i just used a regular saute pan) 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 1/4 of the onions and all of the green beans. Top with the remaining onions. Place into the oven and bake until bubbly, approximately 15 minutes. Remove and serve immediately.