To cook meat, crumble sausage into the Colander; add onion. Place Colander over the 1¾-Qt./1.75 L Casserole. Cook, covered, on high power 5–6 minutes or until no pink remains, stirring once. Remove Colander. Drain and wipe out Casserole. Stir in remaining ingredients. Stack and cook. Stir before serving.