Metabox

function tp_meta_box_register() {
	 add_meta_box( 'tp-recipe-metabox', 'Recipe Settings', 'tp_meta_box_fields', 'recipes', 'normal', 'high', null );
 }
 add_action( 'add_meta_boxes', 'tp_meta_box_register' );


 function tp_meta_box_fields( $post ){
	wp_nonce_field( basename( __FILE__ ), 'tp-metabox-nonce' );
	?>
	<div>

		<label for="calories">Calories: </label>
		<input type="text" id="calories" name="calories" value="<?php echo get_post_meta( $post->ID, 'calories', true ); ?>">
		<br>


	</div>
	<?php
 }


//Save Metabox data
 function tp_save_metabox( $post_id ) {
	if ( ! isset( $_POST['tp-metabox-nonce']) || ! wp_verify_nonce( $_POST['tp-metabox-nonce'], basename( __FILE__ ) ) )
		return $post_id;

	if( ! current_user_can( 'edit_post', $post_id ))
		return $post_id;

	if( defined( "DOING_AUTOSAVE") && DOING_AUTOSAVE )
		return $post_id;

	if ( isset( $_POST['calories'] ) ) {
		update_post_meta( $post_id, 'calories', sanitize_text_field( $_POST['calories'] ) );
	}
 }
 add_action( 'save_post', 'tp_save_metabox' );