In a large bowl, whisk together the olive oil, lime juice, honey, minced garlic, cumin, oregano, salt, black pepper, and crushed red pepper flakes if using.
Add the chicken breasts to the marinade, ensuring they are well coated. Cover the bowl with plastic wrap and refrigerate for at least 1 hour, or up to 4 hours for more flavor.
Preheat your grill to medium-high heat. Remove the chicken from the marinade and let any excess drip off.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Avoid flipping the chicken too often to get nice grill marks.
Once cooked, remove the chicken from the grill and let it rest for 5 minutes before slicing.
Garnish with fresh cilantro and serve with your favorite sides.