functions.php

<?php

// Add post format support
add_theme_support( 'post-formats', array( 'gallery' ) );

// add post-formats to post_type 'my_custom_post_type'
add_post_type_support( 'przepisy', 'post-formats' );

// Custom Gallery Styles
add_filter( 'use_default_gallery_style', '__return_false' );

?>