title: Can't set a cookie using NextJS 9's API Route
body: <p>Typically it seems that when using Express, in the "res" object there is "cookie" so you can do something like:</p>
  
  <pre><code>res.cookie('session', sessionCookie, options);
  </code></pre>
  
  <p>In the API routes offered by NextJS in Next 9, when looking at res, this does not exist. Is there a way to set the cookie for a response object in a Next API Route function?</p>