Add the boneless skinless chicken thighs to a large bowl or a resealable plastic bag.
Combine the cilantro leaves, lime zest, lime juice, chopped garlic cloves, cumin powder, salt, black pepper, and olive oil in a blender.
Pulse the marinade ingredients until smooth and well combined.
Pour the blended marinade over the chicken pieces, ensuring all surfaces are evenly coated.
Seal the bag or cover the bowl and refrigerate to marinate for at least 30 minutes, or up to 4 hours, for best flavor.
Cook the chicken as desired (grill, pan-sear, or bake) until fully cooked and tender. Garnish with fresh cilantro leaves before serving.