Preheat & Prep: Preheat your oven to 375°F (190°C) and grease a 9x13-inch casserole dish.
Steam Veggies: Steam the broccoli until tender and set aside.
Make the Creamy Sauce: In a large bowl, combine the cream of mushroom soup, sour cream, milk, garlic powder, onion powder, salt, and pepper. Mix until smooth.
Combine Ingredients: Stir in the shredded chicken, steamed broccoli, and 1/2 cup of shredded cheddar cheese. Combine well.
Transfer to Dish: Pour the mixture into the prepared casserole dish, spreading it evenly.
Add Topping: Sprinkle the remaining 1/2 cup of shredded cheese on top, followed by the crushed crackers or breadcrumbs for a crispy topping.
Bake to Perfection: Bake for 25-30 minutes or until the casserole is bubbling and the topping turns a beautiful golden brown.
Cool & Serve: Remove from the oven and allow it to cool for a few minutes before serving warm.