Place the chocolate chips in a heatproof bowl set over a saucepan of gently simmering water (double boiler method). Stir until smooth and fully melted. Alternatively, melt the chocolate in the microwave in 20-second intervals, stirring each time until smooth. Let it cool for 2–3 minutes before blending.
Add the silken tofu, maple syrup, salt, and vanilla extract (if using) to a blender or food processor. Blend until smooth and creamy, scraping down the sides as needed.
Pour the slightly cooled melted chocolate into the blender. Blend again until the mixture becomes silky and uniform. Taste and adjust sweetness if needed.
Spoon the mousse into small ramekins or glasses. Refrigerate for at least 1 hour (or up to overnight) to set and thicken.
Serve chilled, topped with vegan whipped cream, fresh berries, shaved chocolate, or a sprinkle of sea salt flakes.
Notes
Store vegan chocolate mousse covered in the refrigerator for up to 4 days. Because the texture of tofu changes when frozen, I do not recommend freezing this recipe.