Preheat oven to 425degrees. Place squash and apples on a rimmed baking sheet. Drizzle with oil; sprinkle with salt and pepper. Toss to coat. Roast until tender, about 25 minutes. Reduce oven setting to 375degrees., Meanwhile, in a Dutch oven, cook bacon over medium heat until crisp, stirring occasionally. Remove with a slotted spoon; drain on paper towels. Discard drippings., Add sausage, celery, onions and carrots to pan; cook over medium-high heat until sausage is no longer pink and vegetables are tender, 10-12 minutes, breaking up sausage into crumbles; drain., Transfer to a large bowl. Add 5 cups stuffing cubes, crackers, evaporated milk, soup, eggs, rice, sour cream, seasonings and reserved squash mixture and bacon; toss. Transfer to two greased 13x9-in. baking dishes. Lightly crush remaining 1 cup stuffing cubes. Sprinkle over tops; dot with butter. , Bake, covered, for 30 minutes. Uncover and bake until bubbly and lightly browned, 15-20 minutes longer.