Preheat & Season: Preheat your oven to 375°F (190°C). Season the chicken breasts with paprika, garlic powder, and salt.
Sear the Chicken: Melt butter in a large skillet over medium heat. Add the chicken breasts and sear for 2-3 minutes per side until golden brown.
Caramelize the Onions: In the same skillet, add the sliced onions and sauté for about 5 minutes until softened and golden.
Simmer in Broth: Pour the French onion soup over the chicken and onions, letting it simmer for about 5 minutes to absorb the flavors.
Bake to Perfection: Transfer everything to a baking dish. Cover with foil and bake for 20 minutes.
Cheesy Finish: Remove the foil, sprinkle mozzarella cheese over the chicken, and bake uncovered for another 5-7 minutes until melted and bubbly.
Serve & Enjoy: Let the dish rest for a few minutes before serving. Pair it with mashed potatoes, roasted vegetables, or a fresh salad for a complete meal.