gistfile1.php

// Before.
$vars['foobar'] = array(
'#markup' => theme('yomamma', array('foo' => $foo, 'bar' => $bar);
);

// After.
$vars['foobar'] = array(
  array(
    '#theme' => 'yomamma',
    '#foo' => $foo,
    '#bar' => $bar
  )
);