French Onion Chicken Bake - EPPYC

Ingredients

• 1.5 lbs boneless skinless chicken breasts, trimmed
• 3 large yellow onions, thinly sliced (approx. 900g)
• 2 tbsp extra virgin olive oil
• 1 tbsp grass-fed butter
• 0.5 tsp sea salt
• 0.5 tsp cracked black pepper
• 3 cloves garlic, minced
• 1 tbsp balsamic vinegar
• 0.25 cup dry sherry
• 1 cup low-sodium beef bone broth
• 1 tsp fresh thyme leaves
• 1 cup shredded Gruyère cheese
• 0.25 cup freshly grated Parmesan
• 4 thin slices whole-grain baguette