Mix the garlic powder into the softened cream. Form into a ball, and refrigerate 30 minutes.
Place the butter and brown sugar in a microwave-safe bowl. Cook 1 minute on High in the microwave, or until butter and brown sugar are melted. Mix in Worcestershire sauce and pecans. Chill 1 hour in the refrigerator, stirring often so that the butter and sugar do not separate.
Spread butter mixture over the cheese ball, and refrigerate until ready to serve.