Heat your grill on high for at least 10 minutes.
In a high speed blender, add the cilantro, lime zest and juice, oil, honey, garlic, jalapeno (if using), salt, and pepper. Blend on high until smooth. Transfer about ¼ cup of the sauce to a small bowl to brush onto the raw chicken.
Skewer the chicken, then brush the ¼ cup reserved sauce all over the skewers, making sure to get all sides and into the nooks and crannies.
Place skewers on the grill and cook, covered, for about 4-5 minutes.. Flip the skewers over (use a metal spatula to help release it if it’s sticking) and brush more cilantro sauce generously over top. Reduce the heat to medium or medium-high and grill for 6-8 more minutes or until cooked through.
Serve with remaining cilantro honey lime sauce for dipping or drizzling.