Place the cottage cheese, cocoa powder, maple syrup, vanilla extract, and sea salt into a high-speed blender or food processor.
Process the mixture on high speed for 60 to 90 seconds until the texture is completely smooth and no curds are visible.
Stop and scrape down the sides of the container with a rubber spatula to ensure all cocoa powder is fully incorporated.
Transfer the blended mixture into two individual glass ramekins or serving bowls.
Refrigerate the mousse for at least 30 minutes to allow the structure to set and the flavors to meld.
Garnish with dark chocolate shavings immediately before serving.