Claire Ptak is an American baker, food writer, and food stylist. She owns and runs a bakery-café, Violet Cakes, in London's East End. Alongside running her own business, Ptak has also published an array of cookbooks and written a food column for the Guardian and the Observer Food Monthly. She is widely known for having baked the royal wedding cake for the wedding of the Duke and Duchess of Sussex – a layered sponge filled and covered with a lemon and elderflower buttercream icing.