Season the steaks with garlic powder, salt and pepper. (If you're using grill seasoning instead of garlic powder, don't add salt and pepper because it’s already in the grill seasoning.). Set aside and let marinate for 30 minutes.
While the steaks are marinating, combine the softened butter, blue cheese, chives and parsley in a medium-size mixing bowl. Drop the butter mixture out onto a piece of wax or parchment paper, shape it into a log and roll up the paper to secure it. Refrigerate the butter to firm it up.