Ate something that expired in November by mistake

It was this bag of Kale bites. I didn't realize they were expired until I had finished the bag. They didn't taste off or even stale. I did a curbside pickup today so an employee picked them out.

I guess I'll just be more careful next time. I once found a soda there that expired 2 years ago.

Idk if complaning to the store will work.

Most processed foods are still good well beyond the expiration date. The expiration date is just the last day the store can sell it but doesn't necessarily mean it's no good to eat. You should be fine. But if you're really worried about it you can call the poison control center and get their advice