Add the milk, cream, chocolate, and cocoa powder to a microwave-safe bowl or jug. Heat in 30 second intervals, stirring after each one, until melted and smooth, and the mixture is hot.
Whisk in the pumpkin, vanilla, and spices until fully combined. Warm up again if necessary.
Pour into mugs or heat-proof glasses, top with whipped cream, and serve immediately.
The calories are an estimate only.