If I only ended up with one or two plants of a certain pepper variety, can I save seeds from it? Or should I just give up on that idea and try to get more seeds from someone else?

I know tomatoes do just fine with inbreeding, but I don't know if I can make assumption that all nightshades are the same way.

I'm not especially worried in this particular case, because I can get more seeds some other way if it turns out I don't have enough plants, but I'm working on perfecting my seed-saving technique in case some day...