01 - Preheat grill to medium-high heat, approximately 400°F.
02 - Whisk together melted butter, parsley, chives, and dill in a small bowl until thoroughly combined.
03 - Combine parmesan cheese, ranch seasoning, garlic powder, and black pepper in a separate bowl.
04 - Brush each ear of corn generously with the herb butter mixture using a basting brush.
05 - Place corn directly on grill grates. Cook for 12 to 15 minutes, rotating every 3 to 4 minutes, until kernels are tender and develop light char marks.
06 - Remove corn from grill. While hot, immediately sprinkle parmesan-ranch mixture evenly over each ear, pressing gently to adhere.
07 - Serve immediately, garnished with additional chopped herbs if desired.