Each time I find a recipe that needs onion powder I just make the recipe without it because it so expensive here. Onion powder is at least $7 and I can never justify the purchase for something I may not use more once before the best-by date. A couple of weeks ago I dried my herbs in the oven because I did not want to throw them out or let them dry in the pots. That is when it dawned on me that I could make my own onion powder.
I felt really silly that I had not thought of doing this before. A couple of years ago my father went to Liberia as a UN peace-keeper. My mother packed for him a lot of dried vegetables including dried onions. Onion powder is ground dried onions. This was really a duh moment for me.