Cheesy Chicken Florentine Casserole | Dinners | Umami

Ingredients

• 4 (4 ounce) skinless, boneless chicken breast halves
• ½ cup unsalted butter
• 2 tablespoons unsalted butter
• 2 cups shredded Parmesan cheese
• 1 ½ pints heavy cream
• 1 (10.5 ounce) can condensed cream of broccoli soup
• 3 tablespoons chopped fresh oregano, or to taste
• 2 tablespoons chopped fresh basil, or to taste
• 2 tablespoons chopped fresh parsley, or to taste
• 1 teaspoon garlic powder, or to taste
• salt and ground black pepper to taste
• 1 (10 ounce) package frozen chopped spinach, thawed and drained
• 2 cups shredded mozzarella cheese