To Make Ahead
Prepare dip as directed; cool slightly. Cover and refrigerate up to 3 weeks.
Transfer chocolate mixture to a medium saucepan. Cook and stir over low heat until smooth and heated through. Or, transfer to a micro-safe dish. Micro-cook, uncovered, on 100 percent power (high) for 35 to 60 seconds or until smooth and heated through, stirring halfway through cooking time. Serve warm, stirring in additional milk as necessary to reach dipping consistency.