
This French Onion Chicken Bake is so savory, simple, and takes less than an hour to prepare.
Preheat the oven to 400 degrees and lightly spray a 13 x 9-inch baking pan with cooking spray.
Add the butter to a large skillet and melt on medium heat. Add in onions and cook for approximately 5 minutes, stirring occasionally.
Reduce heat to medium and add in the garlic, thyme, and pepper, cooking for approximately one minute.
Stir in the balsamic vinegar and beef breath and cook until for about 10 minutes, until the onions reach a soft consistency (similar to jelly.)
When the onions are caramelized, place about 1/3 of the mixture in the baking dish.
Place the chicken on top of the 1/3 of onion mixture in the pan and sprinkle with salt.
Spread the remaining onion mixture on top of the chicken.
Top with Mozzarella and Parmesan cheese and cook for 30 minutes, or until chicken is cooked through.