Preheat oven to 350 degrees F.
In a medium-sized saute pan, heat the oil over medium heat. Add the onion, celery, and apple and saute until just tender. Remove from the heat and add the onion mixture to the bread in a large mixing bowl. In a medium mixing bowl, beat the eggs with the milk, sage, salt, and pepper. Pour over the bread mixture and stir to combine and moisten the bread. Transfer to a casserole dish and bake for about 1 hour or until browned on top. Serve.
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Recipe courtesy Kim Huber-Kaiser, Joe Huber Family Farm, Starlight, Indiana