Every course in Canvas has a unique URL. By adding "/undelete" at the end of the URL in your address bar, you will be brought to a list of recently deleted items which can be restored.
Navigate to your course and add "/undelete" to the end of the URL in the address bar to experience this joy.
For example...
Please note. Not everything can be restored, so there's that.
While you are here, please enjoy this cat hard at work, working on some big plans or something.