In small bowl, combine flour, baking powder, and salt. In large bowl, beat cream cheese with electric mixer until smooth and creamy, about 3 minutes. Add butter to cream cheese and beat until creamy. Beat in sugar, egg, sour cream and vanilla. Add flour mixture into cream cheese mixture, stirring just until moistened. Gently stir in mini chocolate chips. Spoon the batter into prepared pan, filling each muffin cup 2/3 full.