2Preheat your oven to 180°C (350°F).
Roast the chestnuts in the oven for about 20 minutes or until they are tender. Let them cool, then peel and chop them.
In a food processor, blend the oats until they form a coarse flour.
Melt the dark chocolate in a heatproof bowl over a pot of simmering water (double boiler method).
In a mixing bowl, combine the chopped chestnuts, oat flour, melted chocolate, maple syrup, and vanilla extract. Mix well until all ingredients are fully incorporated.
Line a baking dish with parchment paper and spread the mixture evenly in the dish.
Press the mixture down firmly to ensure it is compact.
Refrigerate for at least 2 hours or until the mixture is firm.
Once set, cut into bars and serve. Enjoy your Vegan Chocolate Chestnut Bars!