Delete unused Today Widgets
The following assumes you've got a widget called ExampleWidget.


Ensure that you've removed the application, even if it's running out of your Downloads folder.

To do this, launch Terminal.app on your Mac and type the following commands:

rm -fr /Applications/ExampleWidget*

rm -fr ~/Downloads/ExampleWidget*
Restart Notification Center by running the following command:

pkill -9 -f "NotificationCenter$"