Meanwhile, in 12-inch nonstick skillet, cook bacon over medium-high heat until crisp; remove with slotted spoon. Cook onion and celery in bacon drippings over medium-high heat for 1 to 2 minutes, stirring frequently, until softened. Add broth and 2 tablespoons of the butter; heat to boiling. Stir in stuffing mix, bacon, cranberries and 2 tablespoons of the walnuts. Remove from heat; cover until needed.