Heat the oil in a heavy large skillet over medium heat. Add the pancetta and saute until crisp and golden, about 5 minutes. Using a slotted spoon, transfer the pancetta to a bowl. Add the onion to the pan drippings in the same skillet and saute until translucent, about 4 minutes. Add the spinach...

Preheat oven to 350 degrees F. In a large bowl, combine crumbled cornbread, dried white bread slices, and saltines; set aside. Melt the butter in a large skillet over medium heat. Add the celery and onion and cook until transparent, approximately 5 to 10 minutes. Pour the vegetable mixture over...