4Preheat your oven to 200°C (392°F). Score the chestnuts and roast them in the oven for about 20 minutes until the skins start to peel back.
Once roasted, peel the chestnuts and place them in a food processor. Blend until you get a smooth paste.
Melt the dark chocolate in a heatproof bowl over a pot of simmering water (double boiler method) or in the microwave in short bursts.
In a mixing bowl, combine the chestnut paste, melted chocolate, coconut milk, maple syrup, and vanilla extract. Mix until smooth and well combined.
Pour the mixture into serving glasses or bowls and refrigerate for at least 2 hours to set.
Serve chilled and enjoy your Vegan Chocolate Chestnut Mousse!