In a small bowl, blend together softened butter, dill weed, onion powder, garlic powder, salt (if using), and white pepper.

Transfer the seasoned butter to a cast-iron skillet and heat over medium heat until the butter mixture is melted.

Add the sole fillets to the skillet.

Cook for 3 to 4 minutes on each side or until the fish flakes easily with a fork.

Serve the Dill Butter Sole with additional dill weed and lemon wedges as desired.