01 - Preheat oven to 400°F. Lightly grease a large baking dish with 1 tbsp olive oil.
02 - Arrange sliced bell peppers and red onion evenly in the prepared baking dish. Drizzle with the remaining olive oil, and sprinkle with half the salt, black pepper, Italian seasoning, and smoked paprika. Toss to coat thoroughly.
03 - Pat chicken breasts dry with paper towels and season both sides with the remaining salt, black pepper, Italian seasoning, and smoked paprika. Place the seasoned chicken breasts on top of the vegetables.
04 - Sprinkle minced garlic evenly over the chicken breasts and vegetables.
05 - Cover the baking dish tightly with aluminum foil and bake for 20 minutes.
06 - Remove the foil and sprinkle mozzarella and Parmesan cheeses evenly over the chicken breasts. Return 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.
07 - Remove from the oven and let rest for 5 minutes before serving.