Add both types of chocolate chips, coconut oil, espresso powder, vanilla extract, and salt to a 3 or 4-quart slow cooker. Stir to combine.
Cover and cook on LOW for 1 hour, stirring every 20 minutes, until chocolate is completely melted and smooth.
Once melted, switch slow cooker to WARM setting. Stir in pecans and coconut flakes until everything is evenly coated with chocolate.
Line two baking sheets with parchment paper. Using a tablespoon or small cookie scoop, drop clusters of the chocolate mixture onto the prepared sheets, leaving space between each cluster.
Refrigerate the clusters for at least 1 hour until completely set and firm.
Store in an airtight container in the refrigerator for up to 2 weeks or freeze for up to 3 months.