reassign cpt

<?php

$args = array(
	'post_type'	   => 'post',
	'category_name'    => array(7),
	'nopaging'         => true,
	'suppress_filters' => true,
	'fields'           => 'ids'
);
$posts = new WP_Query($args);
echo '<h1>'. $posts->found_posts .'</h1>';

while( $posts->have_posts() ) {
	$posts->the_post();
	set_post_type( get_the_ID(), 'recipes' );
}

?>