Cook the pasta and broccoli rabe in salted water.
Cook the sausage in a saucepan.
Make the bechamel sauce by melting butter, adding flour, and gradually adding milk.
Combine the cooked pasta, broccoli rabe, sausage, bechamel sauce, mozzarella, and grated cheese in a bowl.
Pour the mixture into a baking dish and bake at 400 degrees Fahrenheit until browned.
Serve warm.
