Heat oven to 375 degrees. In a large mixer bowl, combine sugars and butter. Beat until smooth. Add in egg and vanilla and again mix until well mixed. Add flour, baking soda, and salt. Continue just until well mixed. Stir in nuts and chocolate. Drop by rounded tablespoons of dough 2 inches apart onto ungreased cookie sheets. Bake for 9 to 11 minutes, or until lightly browned. Cool 1 minute on cookie sheet; remove immediately. M&M’s, chocolate chips, etc can be used to replace the candy bar. Doubles/triples well.