01 - Melt the dark chocolate in a heatproof bowl set over a saucepan of simmering water, stirring until smooth. Remove from heat and let cool slightly.
02 - Combine avocados, melted chocolate, cocoa powder, maple syrup, vanilla extract, and sea salt in a food processor or blender.
03 - Blend until completely smooth and creamy, scraping down the sides as needed. Add almond milk one tablespoon at a time if mixture is too thick.
04 - Taste and add more maple syrup if additional sweetness is desired.
05 - Spoon mousse into serving glasses or bowls. Refrigerate for at least 1 hour to chill and set properly.
06 - Top each mousse with fresh raspberries. Garnish with grated dark chocolate or mint leaves if desired before serving.