Preheat oven to 400°F. In greased 2-quart baking dish place broccoli, seasoned with salt and pepper. Top with half the rice, cubed chicken, half the cheese and the remaining rice.
In small saucepan, over low heat, melt butter. Whisk in flour until smooth; stir in milk and packet of dip mix. Increase heat to medium, stirring constantly, whisk mixture until thickened. Remove from heat; whisk in sour cream. Drizzle sauce over entire dish.
Bake 15-20 minutes, remove from oven, top with green onions, if desired, and remaining cheese, return to oven and bake until cheese melts.
Makes 5-6 servings.
Tip: Rotisserie chicken works great for this recipe.