Preheat oven to 275 degrees F (135 degrees C). Butter an 11×14 inch baking dish, and set aside to bake the stuffing.
Arrange sourdough bread pieces on a baking sheet. Toast the bread in preheated oven until crisp and dry, 20 to 30 minutes. Remove from the oven to cool.Increase the oven temperature to 350 degrees F (175 degrees C).
Melt butter in a skillet over medium heat. Stir in the onion and celery; cook and stir until the vegetables are tender, about 10 minutes. Stir in the herbes de Provence and rubbed sage, then stir in the apricots. Turn off the heat, and allow the mixture to rest.
Toss the toasted bread and pecans together in a large bowl. Stir in the celery mixture, then season with salt and pepper. Mix in the chicken broth, one cup at a time. Stir in the egg. Transfer the stuffing to the buttered baking dish.
Bake in the preheated oven until the top is browned, 30 to 35 minutes.
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