01 - Preheat oven to 400°F.
02 - Lightly grease a large baking dish with 1 tablespoon of olive oil.
03 - Arrange the sliced bell peppers and red onion evenly in the prepared baking dish. Drizzle with the remaining olive oil and sprinkle with half of the salt, black pepper, Italian seasoning, and smoked paprika. Toss everything together until the vegetables are evenly coated.
04 - Pat the chicken breasts dry with paper towels. Season both sides of each breast with the remaining salt, black pepper, Italian seasoning, and smoked paprika. Place the seasoned chicken breasts on top of the vegetables in the baking dish.
05 - Sprinkle the minced garlic evenly over the chicken breasts and vegetables.
06 - Cover the baking dish tightly with aluminum foil and bake for 20 minutes.
07 - Remove the foil and sprinkle the shredded mozzarella and grated Parmesan cheeses evenly over the chicken breasts. Return the dish to the oven uncovered and bake for an additional 10 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the cheese is melted and golden brown.
08 - Remove the baking dish from the oven and let the chicken rest for 5 minutes before serving.