Combine ingredients for the crust in food processor until it reaches a coarse consistency that sticks together.
Press the crust evenly into the bottom (and halfway up the sides) of an 8" pie pan or spring form cake pan and set aside.
In a food processor combine all ingredients for the filling until smooth. Blend the pureed avocado in your food processor until smooth.
Then pour filling over the crust, smooth the top with a spatula, and set to chill in the freezer overnight or until it reaches desired consistency. Or you can serve it right away, but it will be more mousse-like without freezing first.
Note: Add more or less maple syrup to sweeten to taste.