Substitute for Onion Powder
Well, you could make your own onion powder. It isn't that difficult.


  
  Peel and finely chop your onions.
  Then, spread the onion pieces out on a tray and heat in a 150°F degree oven or in a food dehydrator until dry.
  
  
  Tip: The onions are dry when you can easily crumble the chopped pieces
  in your hand.
  
  
  Allow the onions to cool. Then, grind with a coffee grinder, spice mill, food processor or mortar and pestle until you reach your desired
  consistency.
  Store your finished onion powder in an air-tight container in a cool, dry spot or freeze.