01 - Preheat the oven to 400°F. Lightly grease a large baking dish.
02 - Arrange the sliced bell peppers and red onion evenly on the bottom of the baking dish. Drizzle with 1 tbsp olive oil and toss to coat.
03 - Place the chicken breasts on top of the vegetables. Brush with the remaining olive oil.
04 - In a small bowl, combine garlic powder, smoked paprika, oregano, salt, and black pepper. Sprinkle this mixture evenly over the chicken breasts.
05 - Dot each chicken breast with 1/2 tbsp cream cheese, spreading slightly.
06 - Mix the mozzarella and cheddar cheeses together, then sprinkle evenly over the chicken breasts.
07 - Bake for 25-30 minutes, or until the chicken is cooked through (internal temperature should reach 165°F) and the cheese is golden and bubbly.
08 - Remove from the oven and let rest for 5 minutes before serving.