Heat oven to 325°F. Place cubed bread on ungreased cookie sheet; bake 10 to 15 minutes or until dry and crispy. Cool completely on cookie sheet.
Meanwhile, spray 4-quart Dutch oven with cooking spray; place over medium-low heat. Add pancetta; cook about 13 minutes, stirring frequently, until rendered and lightly browned. Using slotted spoon, transfer pancetta to large bowl; set aside. Pour off all but 2 tablespoons fat from Dutch oven; discard or reserve for another use.
Melt butter with the 2 tablespoons pancetta fat in Dutch oven. Increase heat to medium-high; add onion, celery, salt and pepper. Cook 6 to 8 minutes, stirring occasionally, until tender. Add apples; cook 2 minutes longer.
Add stock to Dutch oven; heat to simmering. Cook 2 to 3 minutes, stirring frequently, using spoon to release browned bits from bottom. Remove from heat; cool 5 minutes.
Spray 13x9inch (3-quart) glass baking dish with cooking spray; set aside. Add eggs, thyme and sage to pancetta in bowl. Stir in bread. Pour stock mixture over ingredients in bowl. Stir to combine. Pour into baking dish.
Bake uncovered 40 to 45 minutes or until center is hot and top is browned and crispy. Cool 5 minutes. In small bowl, stir together Topping ingredients. Sprinkle over stuffing in dish.
Recipe by The Couple's Kitchen at https://thecoupleskitchen.com/thanksgiving-focaccia-stuffing-with-apples-pancetta/