Reddit reviews Tone's Onion Powder - 20oz shaker

There are ways to get the onion flavor (which is pretty good in something like this) without any actual onions; dry onions are a big improvement (I just used that particular brand the other day), and it looks like onion powder would also work (no personal experience with onion powder, though I'd like to try it the next time I need an onion). For both of those, you should probably find a smaller/cheaper container locally, at least to start with. They should both have direct equivalencies to real onions on the package; the one linked to for dry onions is 2 tablespoons for every half cup of "real" onions, for example.