A 'butter board' is a viral 2022 food trend — a wooden board spread thickly with softened butter (often whipped or flavoured), topped with herbs, honey, salt, edible flowers and torn bread for dipping. Popularised by TikTok creator Justine Doiron. If your teen makes one, they are following a food trend. Harmless and rather wholesome dinner-party fare; just not a daily food given the quantity of butter involved.