In a medium saucepan combine cornstarch and sugar and whisk to combine. Add cocoa, salt, and coconut milk and whisk until no lumps remain.

Bring to a boil on medium heat, whisking constantly. When the mixture comes to a boil, whisk until the mixture thickens (2 minutes). Remove from heat and add in chocolate and vanilla extract and stir until chocolate is melted and the mixture is combined. Immediately pour into ramekins or dessert dishes and refrigerate until ready to serve.