In a small bowl, whisk together egg white powder and water until smooth. Using a paint brush, brush egg white mixture evenly onto rose petals. Dip petals into sugar to coat.
Place sugared petals on a piece of parchment paper. Let dry overnight before using. (Can be made up to 4 days in advance; store in an airtight container at room temperature.)
Recipe by Southern Lady Magazine at https://southernladymagazine.com/cheesecake-bars-recipe/