1. Place first 3 ingredients in a large bowl, stirring with a whisk. Add chicken; toss well to coat. Cover and refrigerate 1 hour.
2. To prepare salsa, combine onion and next 6 ingredients (through jalapeño); stir in 1/4 teaspoon salt. Let stand 1 hour.
3. Preheat grill to medium-high heat.
4. Remove chicken from marinade; discard marinade. Let chicken stand at room temperature 30 minutes. Sprinkle chicken evenly with remaining 1/2 teaspoon salt and black pepper. Place chicken on grill rack coated with cooking spray; grill 6 minutes on each side or until done. Serve with salsa and lime wedges, if desired.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.