Prep: 2 minutes, Cook: 5 hours
Slow-Cooker Size: 4-quart
Combine first 5 ingredients in a 4-quart slow cooker.
Cover and cook on LOW 4 to 5 hours or until thoroughly heated and chocolate is melted, whisking after 2 hours. Whisk before serving. Serve with sweetened whipped cream and grated chocolate, if desired.
Party Tip: Serve this spiked favorite straight from the slow cooker.