French Onion Stuffed Chicken Casserole
- 2 tablespoons unsalted butter
- 4 large onions (halved and thinly sliced)
- Pinch of salt and pepper (to season)
- 2 teaspoons fresh chopped thyme (divided)
- 2 tablespoons white wine, sherry or balsamic vinegar ((OPTIONAL))
- 2 cloves garlic (minced)
- 1/2 cup beef broth or stock (divided)
- 1 tablespoon olive oil
- 4 boneless, skinless chicken breasts
- 2 teaspoons garlic powder
- 1 teaspoon ground thyme
- 1 cup shredded gruyere cheese ((or mozzarella cheese))
- 4 tablespoons freshly grated parmesan cheese
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