1Heat gas or charcoal grill. In medium bowl, mix crushed chips, taco sauce, salt, pepper and beef. Shape mixture into 6 patties, about 5 inches in diameter. Press thumb in center of each patty, creating a slight indentation, until bottom of patty is about 1/2 inch thick.
2Place patties on grill over medium heat. Cover grill; cook 5 minutes. Turn patties; cook about 5 minutes longer or until meat thermometer inserted in center of patties reads 160°F. Top each patty with cheese slice; cook 1 minute or until cheese begins to melt.
3Meanwhile, spray cut sides of buns with cooking spray. Place buns, cut sides down, on grill; cook about 2 minutes or until golden brown.
4To serve, place cheese-topped patties on bottom halves of buns. Top with lettuce, tomato and top halves of buns.