Basic, synchronous way of supporting layouts in express 3.x

express-layout.js

app.engine('mu', function(path, options, fn) {
  var views = app.get('views'),
      view = path;

  if(options.layout) {
    // Assumes layouts and views are at same level
    view = join(views, '..', options.layout);
    options.body = fs.readFileSync(path, 'utf8');
  }

  cons.hogan(view, options, fn);
});