Arrange chopped chestnuts and bread cubes in a single layer on a jelly roll pan.
Bake at 375 for 10 minutes or until lightly browned.
Cook sausage in a large nonstick skillet over medium-high heat 4 minutes or until browned, stirring to crumble.
Add onion and celery; saut 6 minutes or until tender.
Add broth, scraping pan to loosen browned bits.
Combine bread mixture, sausage mixture, sage, thyme, salt, and pepper, tossing to combine. Spoon into a 13 x 9-inch baking pan coated with cooking spray; cover with foil.
Bake at 375 for 20 minutes. Uncover and bake an additional 10 minutes or until golden brown.