Garlic chives (Allium tuberosum) grow a bit larger than onion chives. They have flat leaves and robust flavor and can therefore be overused. For that reason, use sparingly when you first try them.
Garlic chives are outstanding in herb butters.
This plant can become invasive (keep it under control). It produces pretty white flowers (see photo below), scented like violets, great in fresh or dry arrangements.