In large bowl, beat cream cheese with electric mixer on medium speed until smooth. Gradually beat in granulated sugar until fluffy. Beat in vanilla and liqueur. Beat in eggs, 1 at a time, until well blended. Pour in the cooled (but still pourable) melted chocolate, and beat until there are no more streaks and batter looks chocolaty. Add Bisquick™ mix, and beat until incorporated. Pour in milk, and beat until smooth and creamy.