Display post thumbnails in single category listing

Hi,

I have a menu item type of 'single category'. The posts in that category are listed down the page but it's text only. Is there any way I can add just a small thumbnail image with the text so that each post will have the intro text (with Read More button) plus a small 'teaser' image?

I've tried all sorts of settings via the component but can't get one to show and I'm sure someone has already requested or mastered this.

Is there a category listing template that can be adjusted to add the image.

Thanks,

Andrew