01 - Place the chopped dark chocolate in a heatproof bowl over a saucepan of gently simmering water (double boiler). Stir until fully melted, then remove from heat and let cool slightly.
02 - In a food processor or high-speed blender, combine avocados, melted chocolate, maple syrup, vanilla extract, fine sea salt, cocoa powder, and almond milk. Blend until silky smooth, stopping to scrape down the sides as needed.
03 - Taste the mousse and adjust sweetness or chocolate intensity if desired by adding more maple syrup or cocoa powder.
04 - Spoon the mousse into serving glasses or ramekins. Cover and refrigerate for at least 1 hour, or until firm and chilled.
05 - Sprinkle with flaky sea salt and garnish with fresh berries or cocoa nibs just before serving.