Chicken Casserole Stuffed With French Onion

INGREDIENTS:

2 Tbsp of Unsalted Butter
4 Large Onions Halved and Thinly Sliced
A Pinch of Salt and Pepper to Season
2 Tsp of Fresh Chopped Thyme Divided
2 Tbsp of White Wine, Sherry or Balsamic Vinegar (Optional)
2 Cloves Garlic Minced
1/2 Cup of Beef Broth or Stock Divided

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