Site Creator Controller

[HttpGet]
public ActionResult SiteCreator()
{
    var shellSite = SiteContext.GetSite("shell");

    using (new SiteContextSwitcher(shellSite))
    {
        var urlString = new UrlString(UIUtil.GetUri("control:PowerShellRunner"));
        urlString.Append("scriptId", "My SPE Script Id");
        urlString.Append("scriptDb", "master");

        return new JsonResult { Data = urlString.ToString(), JsonRequestBehavior = JsonRequestBehavior.AllowGet };
    }
}