In a small saucepan, melt coconut oil over low heat
Stir in cocoa powder, coconut milk, stevia, and salt, and heat until warm
Remove from heat and stir in vanilla
Scoop out the avocado into a food processor
Add chocolate sauce to food processor
Process on high for about a minute, or until smooth, scraping down the sides as needed
Pour mixture into pie shell
Refrigerate for at least 3 hours to set before serving