Pare potatoes and apples; slice thin. Cut sausage in small pieces. Make white sauce with flour and milk. Put half the potatoes and apples in greased 2 quart casserole; cover with half the white sauce, seasonings, onions and sausage. Add remaining potatoes, apples, seasoning, onions and sausage, then remaining sauce. Cover and bake at 350 degrees for 1 hour. Uncover and continue baking until top is browned.
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