Pour the boiling water over tea bag in a small saucepan.
Cover and let stand 3 - 5 minutes.
Remove tea bag.
Stir in sugar and cocoa powder.
Cook and stir over medium heat just until mixture comes to a boil.
Stir in milk, vanilla, cinnamon, nutmeg; heat throughly.
Do not boil.
Pour into cups.
Top each serving with a dollop of whipped cream.