//* Remove the post title
remove_action( 'genesis_entry_header', 'genesis_do_post_title' );

//* Remove the post info
remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );

//* Add custom function in the post info spot
add_action( 'genesis_entry_header', 'my_custom_function', 12 );

function my_custom_function() {
	echo "HOWDY!";
}