Heat a large nonstick grill pan over medium-high heat. Coat pan with cooking spray. Add chicken to pan; grill 12 minutes or until chicken is done, turning once. Let stand 5 minutes before thinly slicing. Divide chicken evenly among lettuce leaves; top each lettuce leaf with 2 tablespoons mint, 1 tablespoon sprouts, and about 1 teaspoon reserved oil mixture. Serve with lime wedges. Garnish with chopped peanuts, if desired.