I wouldn't worry too much about it, one little one shouldn't do much harm ... but to put your mind completely at ease I am going to give you our favorite advice:
(everyone join in now, chours style)
You can call your avian vet anytime with questions and I am sure that he or she will be more than happy to answer it.
This would just give you 100% piece of mind (so you could sleep tonight) ...
BUT if nothing else, learn your lesson now, what if next time it were chocolate that you left on the counter and didn't think anything about ... God, I hope that doesn't happen ...