[All] What do you do with snacks that are a week past their expiration date?

I bought a lot of snacks when they were on sale, but I didn't eat them, so some of them are past their expiration date...ㅠㅠ Oh Yes and Bintz are past their expiration date by about a week. Can I still eat them? I just stored them in my room. I should have eaten them sooner. I'm a little shocked that I didn't eat them until the expiration date.