In a medium saucepan over low heat, melt the semi-sweet chocolate chips, sweetened condensed milk, and unsalted butter, stirring continuously until smooth. Remove from heat.
Stir in the vanilla extract and caramel sauce until well combined.
Allow the mixture to cool at room temperature for 30 minutes, then refrigerate for 1 hour until firm.
Shape the mixture into 1-inch balls and place on a parchment-lined baking sheet.
Roll each truffle in crushed graham crackers, drizzle with caramel sauce, and sprinkle with sea salt. Refrigerate for at least 30 minutes before serving.