RSS Feed to contain posts from 1 category only

by

This should work for you if you put it in the functions.php file in your theme. Just replace where I have “CATEGORY NAME HERE” with the category name.

function custom_feed_wpse_128087($qv) {
    if (isset($qv['feed'])) {
        $qv['post_type'] = get_post_types();
        $qv['category_name'] = 'CATEGORY NAME HERE';
    }
    return $qv;
}
add_filter('request', 'custom_feed_wpse_128087');