cdils/my-custom-footer.php

## my-custom-footer.php
//* Customize the footer
add_filter( 'genesis_footer_output', 'my_custom_footer' );
function my_custom_footer( $output ) {

    $output = sprintf( '<p>%s<a href="http://www.studiopress.com/">%s</a></p>', __( 'Powered by ', 'sixteen-nine' ), __( 'Genesis', 'sixteen-nine' ) );
    return $output;

}

## output-option-1.php
$output = sprintf( '<p>%s<a href="http://www.starbucks.com/">%s</a></p>',  __( 'Powered by ', 'sixteen-nine' ), __( 'Starbucks', 'sixteen-nine' ) );

## output-option-2.php
$output = sprintf( '<p><a href="http://www.starbucks.com/">%s</a></p>',  __( 'I love Starbucks', 'sixteen-nine' ) );

## sixteen-nine-custom-footer.php
//* Customize the footer
add_filter( 'genesis_footer_output', 'sixteen_nine_custom_footer' );
function sixteen_nine_custom_footer( $output ) {

	$output = sprintf( '<p>%s<a href="http://www.studiopress.com/">%s</a></p>',  __( 'Powered by ', 'sixteen-nine' ), __( 'Genesis', 'sixteen-nine' ) );
	return $output;

}