Baked Garlic Parmesan Chicken and Potatoes

INGREDIENTS
6 bone-in chicken thighs (skin-on, optional)
1 pound baby Dutch potatoes, halved or quartered
3-4 cups baby spinach, chopped
4 tablespoons unsalted butter, divided
1 tablespoon Italian seasoning
kosher salt and freshly ground pepper, to taste
fresh parsley, optional
Sauce:
1 cup low-sodium chicken broth
1/2 cup half and half
1/2 cup parmesan cheese, grated
1/4 cup (1/2 stick) unsalted butter
1/4 cup all-purpose flour
4 cloves garlic, minced
1 teaspoon dried thyme
1 teaspoon dried basil
1/2 teaspoon dried oregano

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