Check them carefully for any that aren't crispy,( I always find a few), before jarring them up. On damp one can cause mold. Had this happen recently with a batch of mushrooms, had to thr out the whole jar.
Its great to be able to fit so many onions in a jar, and they will rehydrate in whatever you put them in. Try it in a stew or soup. I dry tons of celery, onions, carrots and leeks, I cook with these the most, hence, dry these the most.
Its a good feeling to preserve!
Today im drying tomatoes from my garden.