Cook the broccoli and rice to your liking. Set aside.
Preheat the oven to 350F.
Spray a 9x13" pan or large casserole dish with cooking spray.
Spread the rice in an even layer in the baking dish. Make a second layer with the broccoli. In a large bowl, mix the soup, sour cream, mayonnaise, lemon juice, chicken, half the cheese, and some salt and pepper.
Pour the mixture over the broccoli and top with the remaining cheese.