Used predominately for finishing seasonings and garnish, onion powder is the finely and meticulously ground version of minced onion. Dishes that have mainly liquid bases like soups, sauces and chowders would benefit from onion powder over minced or fresh onion because the extremely find ground consistency will allow it to dissolve and infuse into the liquid components of your dish. 1 tsp = 1 small onion.  

Onion Powder