In the container of a blender, combine 2 cups water and pumpkin; process for 1 minute, stopping occasionally to scrape sides of container.
In a large saucepan, combine pumpkin mixture, milk, brown sugar, pumpkin pie spice, ginger, and remaining ½ cup water, stirring until sugar is dissolved. Bring to a simmer over medium heat, stirring frequently (do not boil). Reduce heat to low. Add white chocolate chips and vanilla extract, whisking until smooth. Using a slotted spoon, discard ginger.
Ladle into serving mugs; top with marshmallows. Using a small kitchen torch, lightly toast marshmallows. Garnish with pumpkin pie spice, if desired.
Notes
*We used Libby’s Pumpkin, Ghirardelli Classic White Baking Chips, and Lake Champlain Chocolates Gourmet Vanilla Marshmallows.
Recipe by Victoria at https://victoriamag.com/pumpkin-white-chocolate-hot-chocolate-recipe/