Add 1 1/2 cups chopped dark chocolate to a pot on the stove set to low heat.
Cook, stirring constantly until the chocolate has melted, then immediately remove the pot from the heat.
Slice 1 medium avocado in half, remove the pit, and scoop the flesh into a food processor or blender.
Add the melted chocolate to the food processor or blender.
Blend to combine.
Transfer the chocolate avocado mixture to a bowl, then place it in the fridge to chill for 25-30 minutes or until it’s solid enough to hold its shape.
Scoop out 1 heaping tablespoon of the chocolate avocado mixture, then use your hands to shape it into a ball before placing it on a plate or sheet pan lined with parchment paper or a silicone baking mat.
Immediately add a small sprinkle of sea salt on top, if desired.
Repeat steps 7-8 with the rest of the chocolate avocado mixture (you should end up with 12 balls).
Place the plate or sheet pan of truffles in the fridge to chill for at least 15 minutes before serving.