National Parchment Day is observed worldwide every last Wednesday of June. Established in 2016 by PaperChef, an American manufacturer of parchment paper products, the holiday aims to promote the use of parchment paper in cooking and educate the public on its benefits. Parchment paper, also known as vegetable parchment or culinary parchment, is a cellulose-based material that is non-stick, grease-resistant, and heat-resistant, making it ideal for various cooking and baking applications. Common uses include lining baking sheets, wrapping food for cooking en papillote, and creating pastry bags. Celebrating National Parchment Day typically involves cooking dishes using parchment paper, such as chocolate chip cookies or chicken en papillote.