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Pour two-thirds of the oat milk into a saucepan. Add the cocoa, cinnamon, nutmeg, cardamom pod and coffee. Bring to the boil over a medium-high heat. Cook for 1-2 mins.
Reduce the heat to medium and stir in the vanilla and agave. Froth the remaining oat milk using an electric milk frother or the mini whisk attachment on a hand blender. Strain the hot chocolate into two mugs, discarding the cinnamon and cardamom pod, then gently pour in the frothed milk.
Top with whipped cream, chocolate shavings and a pinch each of cinnamon and nutmeg, if you like.