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1. In a 10-inch skillet cook ground beef and onion until meat is brown and onion is tender. Drain fat; discard. Stir beans, soup, and salsa into beef mixture. Heat through.
2. Divide beef-bean mixture among tostada shells. Top with cheese, lettuce, and tomatoes. If desired, serve with sour cream or avocado dip. Makes 4 servings.