In a medium mixing bowl, whisk together the lime juice, olive oil, minced garlic, chopped cilantro, cumin, salt, and pepper to create the marinade.
Place the chicken thighs in a large resealable plastic bag or a shallow glass dish and pour the marinade over the meat, ensuring even coating.
Refrigerate and marinate for a minimum of 30 minutes, or up to 4 hours for maximum flavor penetration.
Preheat a cast iron skillet or outdoor grill to medium-high heat, approximately 400 degrees Fahrenheit.
Place the chicken on the heated surface and cook for 6 to 8 minutes per side, or until the internal temperature reaches 165 degrees Fahrenheit using a probe thermometer.
Transfer the chicken to a clean plate and allow it to rest for 5 minutes before slicing or serving to ensure juice retention.