- Preheat oven to 400°F. Lightly coat a baking dish with cooking spray.
Sauté the Onions
- Melt butter in a large skillet over medium-high heat.
- Add onions and cook for about 5 minutes, stirring occasionally.
Infuse Flavors
- Reduce heat to medium. Add garlic, black pepper, and thyme. Stir and cook for 1 minute.
Caramelize to Jammy Goodness
- Pour in beef broth and balsamic vinegar. Cook until the onions reach a jam-like texture, about 10 minutes.
Assemble the Dish
- Spread one-third of the caramelized onions in the baking dish.
- Place chicken breasts on top and season with salt.
Cheese It Up
- Cover the chicken with the remaining onions.
- Sprinkle mozzarella and Parmesan generously over the top.
Bake to Perfection
- Bake for 30 minutes, or until chicken reaches an internal temperature of 165°F.
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