In a large skillet over medium heat, fry bacon until crisp; remove & drain on paper towel. In bacon drippings, cook onion & celery about 1-2 minutes, stirring frequently, until softened. Add broth & 2 Tbsp butter; heat to boiling. Stir in stuffing mix, cranberries & 2 Tbsp of the walnuts. Remove from heat, cover & set aside.