Place the first 11 ingredients in a food processor; process until smooth, scraping sides of processor bowl once. Combine yogurt mixture and chicken in a large zip-top heavy-duty plastic bag. Seal bag, and marinate in refrigerator 2 hours, turning bag occasionally.
Remove chicken from bag, and discard marinade. Thread chicken strips onto 24 (6-inch) skewers. Place skewers on broiler pan coated with cooking spray, and broil 6 minutes on each side or until chicken is done. Arrange skewers on a serving platter, and garnish with lemon wedges and cilantro sprigs, if desired.