Brown ground beef in small nonstick skillet over medium heat 8 to 10 minutes or until beef is no longer pink, breaking up into small crumbles.
Meanwhile open the macaroni packets and empty contents into 1-quart microwave-safe bowl. Add water to macaroni, stir with spoon. Microwave, uncovered on HIGH 4-1/2 to 5 minutes, or until macaroni is tender. Using pot holders, remove bowl from microwave oven. DO NOT drain off water. Open cheese sauce mix packets and add contents to macaroni. Stir carefully to mix well. Let macaroni and cheese stand 1 to 2 minutes to allow sauce to thicken. Remove beef from skillet with slotted spoon and add to macaroni and cheese. Stir to mix well.