// Register custom image size for Featured Hero image.
add_image_size( 'featured-hero', 1910, 936, true );

add_action( 'genesis_after_header', 'sk_featured_image' );
/**
 * Display featured image (if present) below the header on single Post pages.
 */
function sk_featured_image() {
	// if this is not a single post having a featured image, abort.
	if ( ! ( is_singular( 'post' ) && has_post_thumbnail() ) ) {
		return;
	}

	echo '<div class="featured-hero">';
		the_post_thumbnail( 'featured-hero' );
	echo '</div>';

}