CUPCAKES: Preheat oven to 350 degrees. Line cupcake pans with paper liners. In microwave oven carefully melt chocolate squares with whipping cream, stirring often, until completely melted. Cool for about 15 minutes. In a large mixer bowl, beat cake mix, sour cream, oil, eggs and chocolate mixture on low speed for 30 seconds and then on medium speed for 2 minutes. Pour batter into cupcake liners, filling them about half full.
Bake 12-13 minutes or until just a light golden brown. Cool for 5 minutes and then place cupcakes on a wire rack to cool completely.