Preheat oven to 350 degrees. Spread bread cubes on cookie sheets in a single layer and bake in oven until cubes are dry, about 15 minutes.
In a large skillet, heat oil and sauté onion and celery until soft. Add apples and sausages and sauté until apples are soft, about 3 minutes. Remove from heat.
In a large mixing bowl, combine bread cubes, onion mixture and remaining ingredients. Mix until bread is thoroughly moistened.
Place stuffing into a lightly oiled baking dish. Bake covered in a 350-degree oven for 45 minutes. Remove cover and continue baking to let stuffing brown, about 10 minutes. Alternatively, place stuffing into turkey cavity, lightly packed, and cook according to weight of the bird.
*To make flax egg: For each egg called for, combine 1 tablespoon ground flax meal with 3 tablespoons warm water. Let stand until mixture is thick, about 10 minutes. Use flax gel in place of eggs, plus an additional ½ cup chicken or vegetable broth.