Preheat oven to 375°F (190°C).
Place the chicken breasts in a large baking dish. Season with salt, pepper, garlic powder, and paprika.
Scatter the sliced peppers and onion around and over the chicken.
Drizzle everything with olive oil.
Bake in the preheated oven for 25 minutes.
Remove from the oven and sprinkle shredded mozzarella cheese over the chicken and vegetables.
Return to the oven and bake for an additional 10 minutes, or until the cheese is melted and bubbly and the chicken reaches an internal temperature of 165°F (74°C).
Garnish with fresh parsley before serving.
Prep Time: 10 minutes | Cooking Time: 35 minutes | Total Time: 45 minutes
