Heat a large skillet over medium-high heat. Add bacon and cook 8 minutes, turning once, until crispy. Remove to a plate, leaving bacon fat. Chop bacon.Advertisement
Add carrot, celery and onion to skillet and cook 8 minutes, stirring frequently. Add broth and 2 tbsp of the butter; bring to a simmer. Stir in bread cubes, chestnuts, salt and pepper. Cover, remove from heat and let stand 5 minutes.
To serve, fluff with a fork and dot with remaining 2 tbsp butter.