Mix cocoa and flour in 2-quart saucepan. Stir in brown sugar, milk, cloves,
and 1 stick cinnamon. Heat just to boiling over medium heat, stirring
constantly; reduce heat. Simmer uncovered for 5 minutes (DO NOT boil). Remove
from heat; remove cloves and cinnamon.
Stir in powdered sugar and vanilla. Beat with wire whisk or hand mixer
until foamy.
Pour into 4 cups or mugs. Serve with whipped cream and cinnamon sticks.