Preheat your oven to 375°F (190°C) and grease a medium baking dish.
In a large bowl, mix together the cream cheese, mayo, sour cream, garlic powder, onion powder, salt, and pepper.
Stir in the shredded chicken, broccoli, and 1 cup of cheddar cheese until everything's well coated.
Pour the mixture into your baking dish and spread it out evenly.
Sprinkle the remaining ½ cup of cheddar cheese on top.
Bake uncovered for about 30–35 minutes, or until bubbly and golden brown on top.
Let it cool for a few minutes before serving. Garnish with parsley if you’re feeling fancy.