Programmatically Render a Webform
I managed to find a method for the webform entity class called getSubmissionForm. I found it in the webform module code in src/Entity/Webform.php 

I invoked it like so

$webform = \Drupal::entityTypeManager()-&gt;getStorage('webform')-&gt;load('my_webform');
$webform = $webform-&gt;getSubmissionForm();

return $webform;


Which returned the specified webform rendered.