Cheesy Chicken Florentine Recipe

• 2 (12 oz) packages Stouffer's frozen spinach souffle, defrosted (in microwave on 50% power, 6-7 minutes)
• 6 boneless, skinless chicken breast halves, seasoned with salt and pepper
• 2 Tbsp vegetable oil
• 2 cups cooked white rice
• 1 cup milk
• 1 cup shredded Swiss cheese, divided
• 1/4 cup chopped onion
• 2 tsp Dijon mustard
• 1/2 tsp salt
• 1 cup coarse fresh breadcrumbs
• 2 Tbsp butter or margarine, melted

Directions