We have used a plugin called Recently Popular by Eric Biven and Caio Costa. You will need to install their plugin and then go to Appearance -> Widgets.
- Drag the Recently Popular widget over to your desired sidebar
- Configure your desired settings
- Click on Show/hide advanced options
- Input the below code into Format each results as:
<img src="%thumbnail_url% " alt="" width="59" height="58" /><a href="%post_url%">%post_title%</a> Posted on %publish_date% by %display_name%