gistfile1.pl

$ cat myapp.pl
#!/usr/bin/env perl
use Mojolicious::Lite;

get '/' => sub {
  my $self = shift;
  my $text;

  $text  = $self->render_partial('a', body => rand());
  $text .= $self->render_partial('b', body => rand());

  $self->render(text => $text);
};

app->start;
__DATA__

@@ layouts/default.html.ep
%= content $body

@@ a.html.ep
% layout 'default';
% content $body => begin
  A!
% end

@@ b.html.ep
% layout 'default';
% content $body => begin
  b.
% end