**Preheat the Oven:** Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish.
**Prepare the Chicken:** Arrange the chicken breasts in the baking dish in a single layer.
**Make the Cream Cheese Mixture:** In a mixing bowl, combine cream cheese, mozzarella, Parmesan, sour cream, garlic powder, onion powder, paprika, salt, and pepper. Mix until smooth and creamy.
**Spread the Mixture:** Evenly spread the cream cheese mixture over the chicken breasts, covering them completely.
**Bake the Chicken:** Bake the chicken in the preheated oven for 25-30 minutes, or until the internal temperature of the chicken reaches 165°F (74°C).
**Broil for a Golden Top:** For a golden, bubbly top, broil the chicken on high for 2-3 minutes after baking.
**Garnish and Serve:** Remove the chicken from the oven, let it rest for a few minutes, and sprinkle with fresh parsley before serving.