In 2-quart saucepan, mix seasoned ground beef, salsa and corn. Cook over medium heat, stirring occasionally, until thoroughly heated. Stir in 1/2 cup of the cheese.
Spoon about 1/2 cup beef mixture into each lettuce leaf; place 2 on each individual plate. Top each lettuce cup with about 1 tablespoon remaining cheese, 1/4 cup crushed chips and 1 tablespoon sour cream.