Cheesy Chicken and Broccoli Bake Recipe

• 4 boneless, skinless chicken breast (about 1 1/2 lbs)
• salt and pepper
• 4 Tbsp unsalted butter
• 1 onion, chopped fine
• 1/4 cup all-purpose flour
• 1 cup low-sodium chicken broth
• 1/2 cup heavy cream
• 1/2 cup dry sherry
• 1 1/2 lbs broccoli, florets chopped, stems peeled and sliced thin
• 1 1/2 cups grated Parmesan cheese

Directions