View functions.php
<?php //* Do not include this opening php tag
//* Add Cart icon and count to header if WC is active
add_action( 'genesis_header', 'jmd_wc_cart_count' );
function jmd_wc_cart_count() {
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
$count = WC()->cart->cart_contents_count;