Onion powder is made from dehydrated onions giving it a concentrated flavor that pairs well with many foods. Onion powder has an intense flavour which makes it a good substitute for salt in many recipes including burgers salads and soups. Onion powder can be used in anything that that desires an onion flavor in often even when using fresh onions as the onion powder lays a subtle foundation of onion flavor while the fresh onions add strong onion hits.