Heat gas or charcoal grill to medium heat. Shape ground beef into 12 (3 1/2-inch) patties. Place 6 patties on sheet of waxed paper. Top each with about 2 teaspoons chiles and 1 heaping tablespoon cheese. Place remaining patties over filling; press edges to seal.
When ready to grill, place filled patties on gas grill over medium heat or on charcoal grill 4 to 6 inches from medium coals. Cook 11 to 13 minutes or until beef is thoroughly cooked, turning once. Serve in buns with sour cream, salsa and lettuce.