Code snippet to add a "Settings" link to your plugin on the plugins page

plugin.php

add_filter('plugin_action_links_'.plugin_basename(__FILE__), 'salcode_add_plugin_page_settings_link');
function salcode_add_plugin_page_settings_link( $links ) {
	$links[] = '<a href="' .
		admin_url( 'options-general.php?page=my-plugin' ) .
		'">' . __('Settings') . '</a>';
	return $links;
}

Thank you for sharing this quick snippet.