Chop the chocolate into small pieces. Put it in a small saucepan.
Melt the chocolate in a water bath.
Put the tofu in a stand mixer. Scrape out the vanilla bean.
Add vanilla and chocolate and start the stand mixer. Mix until the mixture is well combined.
Vegan chocolate mousse with silken tofu looks best in a beautiful glass. If you like, you can dress it with chocolate sprinkles, vegan cream or yogurt.