use Mojolicious::Lite;

# Route leading to an action that renders a template
get '/bar' => sub {
  my $self = shift;
  $self->stash(one => 23);
  $self->render('baz', two => 24);
};

app->start;
__DATA__

@@ baz.html.ep
The magic numbers are <%= $one %> and <%= $two %>.

##</code><code>##

get '/bar' => sub {
  my $self = shift;
  if( $cond ) {
    $self->stash( one => 23 );
  }
  else {
    $self->stash( two => 42 );
  }
  $self->render('baz');
}

app_start;
__DATA__
@@ baz.html.ep
<%= $one %> or <%= $two %>.

##</code><code>##

%= stash 'foo'
% stash foo => 'bar';
   ...
%= stash('name') // 'Somebody'