In a mixing bowl, combine olive oil, taco seasoning, fresh lime juice, lime zest, brown sugar, minced garlic, salt and pepper. Whisk together until the ingredients are well incorporated.
Place the pounded chicken breasts in a shallow dish or a resealable plastic bag.
Pour the marinade over the chicken, ensuring each piece is evenly coated. Cover the dish or seal the bag and refrigerate for at least 1 hour, or ideally overnight, to allow the flavors to meld and the chicken to tenderize.
Preheat your grill to medium-high heat. Lightly oiled the grill to prevent sticking.
Place the chicken breasts on the preheated grill. Discard any excess marinade left in the dish or bag.
Grill the chicken for approximately 6-8 minutes per side, or until the internal temperature reaches 165°F. Cooking times may vary depending on the thickness of the chicken breasts.
Once cooked through, remove the chicken from the grill and transfer it to a clean plate. Allow the chicken to rest for a few minutes to let the juices redistribute, ensuring a tender and juicy bite.
Garnish with green onions, chopped cilantro and lime wedges if desired.
