French Onion Stuffed Chicken Casserole

INGREDIENTS:

• 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

INSTRUCTIONS:

1. Preheat oven to 400°F (200°C). 
2. Lightly grease a 9x12-inch baking dish. Set aside.
3. Melt butter in a large skillet over medium-high heat. Add onions and season with salt, pepper and half of the fresh chopped thyme. Cook for 5-8 minutes until soft.
4. Reduce heat to medium and cook, while stirring occasionally, until onions are caramelized and jammy (about 15 minutes). Pour in 1/4 cup of broth if pan gets too dry, and keep stirring until onions are browned. 
5. OPTIONAL: Pour in white wine, sherry or balsamic vinegar to deglaze the pan and get some additional flavours into the onions. Let cook for a minute until the sauce thickens slightly.
6. Stir in garlic and cook until fragrant, about 1 minute. Turn off heat and let cool slightly.
7. Cut chicken breasts in half horizontally to create pockets. Season chicken all over and inside pockets with salt, pepper, garlic powder and ground thyme. 
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