For the Mug Cake, microwave chocolate morsels and butter in microwavable coffee mug on HIGH 30 seconds or until melted. Stir. Add remaining ingredients except pecans; mix well. Gently stir in pecans.
Microwave on HIGH 45 seconds to 1 minute or until center looks almost set. Let stand 5 minutes before serving.
Meanwhile, for the Frosting, mix cream cheese and sugar in small bowl until well blended. Stir in milk. Drizzle over mug cake.