Here we are going to show you how to add a column of features image in Custom Post Type Grid in back end

Here is corresponding code to the workaround we created a custom post type with the slug team so hooks become like

The following hooks pattern is used

add_filter('manage_{post type slug}_posts_columns', 'callback_function_to_add_column');

add_action('manage_{post type slug}_posts_custom_column', 'callback_function_for_data', 10, 2);

The following is complete code workaround

add_filter('manage_cookie-drops_posts_columns', 'cookie_drops_custom_column');
function cookie_drops_custom_column($defaults) {
    $defaults['featured_image'] = 'Featured Image';
    $defaults['cookie_status']  = 'Cookie Status';
    $defaults['cookie_qty']          = 'Cookie Qty';
    return $defaults;
}


add_filter('manage_cookie-drops_posts_custom_column', 'cookie_drops_custom_column_data',10, 2);
function cookie_drops_custom_column_data($column_name, $post_ID){

        if ($column_name == 'featured_image') {

           $post_thumbnail_id = get_post_thumbnail_id($post_ID);
        $src = wp_get_attachment_image_src($post_thumbnail_id, 'featured_preview');
        if ($src) {
            echo '';
        }
    }

    if ($column_name == 'cookie_status') {
        echo get_post_meta ( $post_ID, 'cookie_status', true ); 
    }

    if ($column_name == 'cookie_qty') {
        echo get_post_meta ( $post_ID, 'stock_quantity', true ); 
    }
}