One-Pot Broccoli, Chicken & Rice Casserole

Ingredients

• 2 tablespoons unsalted butter
• 1 tablespoon olive oil
• 1 onion, finely chopped
• 2 cloves garlic, minced
• 1 pound chicken thighs, boneless and skinless, cut into bite-sized pieces
• 2 1/2 tablespoons flour
• 2 cups milk
• 2 cups chicken broth
• 1 1/4 cups white long-grain rice
• 1 teaspoon dried thyme
• salt, to taste
• pepper, to taste
• 1 large crown broccoli, cut into small florets
• 2 cups mozzarella or cheddar, shredded, divided
• parsley, optional, finely chopped, for garnish