01 - Preheat the oven to 400°F. Lightly grease a large baking dish with cooking spray or a thin coat of olive oil.
02 - Spread the sliced red, yellow, and green bell peppers along with the sliced red onion evenly across the bottom of the prepared baking dish. Drizzle with 1 tablespoon of olive oil, season with ¼ teaspoon salt and ¼ teaspoon black pepper, and toss to coat thoroughly.
03 - Place the chicken breasts on top of the seasoned vegetables. Brush the chicken with the remaining 1 tablespoon of olive oil, rub the minced garlic over each breast, and season evenly with the smoked paprika, dried Italian herbs, and the remaining ¼ teaspoon salt and ¼ teaspoon black pepper.
04 - Sprinkle the shredded mozzarella and grated Parmesan cheeses evenly over the chicken breasts and surrounding vegetables.
05 - Bake uncovered for 25 to 30 minutes, until the chicken reaches an internal temperature of 165°F and the cheese is melted, golden, and bubbly.
06 - Remove from the oven and let the dish rest for 5 minutes before serving. Serve hot, garnished with fresh herbs if desired. Pairs well with a crisp green salad or steamed rice and a glass of Chardonnay or Sauvignon Blanc.