Place star anise, whole cloves, allspice, cinnamon sticks, white pepper, green cardamon pod and water in a small saucepan. Bring to a boil, then remove from heat; let steep, covered, for 20 minutes.
Add non-dairy milk to saucepan and bring to a boil; remove from heat, and add tea bags, pumpkin, maple syrup and vanilla. Let steep, covered, for 10 minutes. Strain into serving mugs. Top with whipped cream or cashew cream if desired.
This is not too sweet, so adjust the amount of maple syrup to suit your taste if you like it sweeter. For vegan version, use cashew cream in place of whipped topping.