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 olive oil and toss gently to coat.
03 - Place the chicken breasts on top of the vegetable layer. Brush each breast with the remaining 1 tbsp olive oil.
04 - In a small bowl, mix together the garlic powder, smoked paprika, dried oregano, salt, and black pepper. Sprinkle the seasoning blend 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 distribute the mixture evenly over the seasoned chicken breasts.
07 - Bake for 25 to 30 minutes, until the chicken reaches an internal temperature of 165°F and the cheese is golden and bubbly.
08 - Remove the dish from the oven and let the chicken rest for 5 minutes before serving to allow the juices to redistribute.