01 - Preheat the oven to 400°F. Lightly grease a large baking dish with olive oil or cooking spray.
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 tbsp of olive oil and toss gently to coat all the vegetables.
03 - Lay the chicken breasts on top of the bed of vegetables. Brush each breast with the remaining 1 tbsp of olive oil.
04 - In a small bowl, combine the garlic powder, smoked paprika, dried oregano, salt, and black pepper. Sprinkle the seasoning mixture evenly over each chicken breast.
05 - Dot each chicken breast with approximately 1/2 tbsp of softened cream cheese, spreading it slightly across the surface.
06 - Toss the shredded mozzarella and cheddar cheeses together, then sprinkle the blend evenly over the cream cheese-topped chicken breasts.
07 - Bake for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is melted, golden, and bubbly.
08 - Remove the baking dish from the oven and let the chicken rest for 5 minutes before serving to allow the juices to redistribute.