Add beef to Colander and place on 1¾-Qt./1.75 L Casserole. Cover and microwave on high power 5–6 minutes, stirring halfway through. Drain and wipe Casserole clean. Transfer meat to 1¾-Qt./1.75 L Casserole, add tomato sauce, taco sauce and kidney beans with liquid. Stack and cook . To serve, top with cheese, lettuce and tomatoes and tortilla chips.