List post titles in sidebar

Sorry I’ve searched the site, the forums and plugins but I can’t seem to find an answer for this…

I’d like to list all my posts (titles only) in the sidebar in a collapsible list the way Blogger.com blogs do it. (eg. https://fakesteve.blogspot.com) Does anyone know of a plugin that does this?

I also tried editing the wp_get_archives in sidebar.php to postbypost (as a temporary workaround) but it had no effect. I’m assuming it’s because my Archives list is a widget? What file do I need to edit so my Archives widget does postbypost?

Thanks a lot.