French Onion Chicken

INGREDIENTS:

4 8-oz Boneless skinless chicken breasts
2 tsp Sea salt
1/4 tsp Black pepper
1 tbsp Olive oil
2 tbsp Unsalted butter
3 small White onions (or 1 1/2 large ones; peeled and sliced)
1 tsp Fresh thyme leaves
1/2 cup White wine
1/2 cup Chicken broth, reduced sodium
4 slices Swiss cheese
1/3 cup Parmesan cheese (shredded)

DIRECTIONS:

Preheat the oven to 400 degrees F (205 degrees C).
Pat the chicken breasts dry with paper towels. Season with salt and pepper.
Heat the oil in a large oven-safe skillet over medium-high heat. Add the chicken and sear for 2 to 3 minutes, until golden. Transfer to a plate and cover to keep warm.
Decrease heat to medium. Add the butter and onions. Stir and let the butter melt. Decrease heat to medium-low, cover, and cook for 5 minutes stirring occasionally …