Season the chicken breasts with paprika, garlic powder, onion powder, salt, and pepper.
Heat olive oil in a skillet over medium heat and cook the chicken until golden brown and no longer pink in the center, about 6-8 minutes per side; let rest, then dice into bite-sized pieces.
In the same skillet or a saucepan, heat the Alfredo sauce over medium heat until simmering, then reduce heat and let it thicken slightly.
In a large bowl, combine the diced chicken, steamed broccoli florets, and Alfredo sauce, stirring until well coated.
Transfer the mixture to a baking dish and spread evenly.
Sprinkle the shredded mozzarella and grated Parmesan cheese evenly over the top.
Bake in a preheated 375°F (190°C) oven for 20-25 minutes, until the cheese is melted and bubbly and the edges are golden brown.
Let cool for a few minutes, garnish with fresh parsley, and serve hot.