Cheesy Chicken with broccoli

2 pounds broccoli florets and cooked 4 cups rice cooked 1/4 cup butter or substitute 1 large onion chopped 2 cups celery chopped, one bunch 1 pound mushrooms[...]

5 chicken breasts , cooked and cubed 2 tablespoons butter 1/4 cup onion , diced 2 tablespoons flour 2 cups heavy whipping cream 1 cup water 1 lb Velveeta[...]