In the bowl of a food processor, combine the avocado flesh, coconut cream, and powdered sweetener. Secure the lid and blend on high for 1 minute, or until the mixture is completely smooth and creamy.
Add the unsweetened cocoa powder, espresso powder, vanilla extract, cinnamon, and sea salt to the processor. Scrape down the sides of the bowl.
Blend again on high for 30-60 seconds, until the mousse is silky, thick, and no streaks of avocado remain.
Divide the mousse evenly among 6 small serving glasses or ramekins. Chill in the refrigerator for at least 1 hour to set.
Just before serving, top with toasted coconut flakes or chocolate shavings, if desired.