1. Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).
2. Pour some of the mushroom cream sauce into a 9- x 13-inch (23- x 33-cm) baking pan. Add a layer of lasagna noodles. Spread on a layer of broccoli mixture. Pour on some more cream sauce. Repeat until the noodles are done, ending with the cream sauce.
3. Bake covered for 45 minutes.