French Onion Chicken Bake

4 tablespoons Butter
2 tablespoons Balsamic Vinegar
2/3 c Low Sodium Beef Broth
4 Onions, peeled and sliced
1 c Mozzarella Cheese, shredded
4 Chicken Breasts, boneless skinless
1/2 c Parmesan Cheese, shredded
1/2 teaspoon Pepper
1/2 teaspoon salt
4 cloves Garlic, minced
1 teaspoon thyme
How To Make French Onion Chicken Bake
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