1Make, bake and cool cupcakes as directed on box, using water, oil and eggs.
2In medium bowl, beat ricotta cheese, powdered sugar and vanilla with whisk about 1 minute or until smooth. Spoon mixture into decorating bag with large round tip. Pipe ricotta mixture onto cupcakes, leaving room at edge (mixture will spread). Refrigerate 1 hour.
3Meanwhile, in 1-quart saucepan, heat whipping cream over medium heat just until very hot but not boiling. Remove from heat. Beat in chocolate with whisk until completely melted. Let stand at least 30 minutes or until thickened and almost cool.
4Spoon dollop or 2 of chocolate mixture onto each cupcake. Refrigerate until ready to serve.