Combine apples and lemon juice in a large bowl. Add the sweet potatoes and the next 4 ingredients (sweet potatoes through pepper). Place the sweet potato mixture in a 13 x 9-inch baking dish coated with cooking spray. Bake at 400° for 40 minutes, stirring after 25 minutes.
Place bread in a food processor; pulse 10 times or until coarse crumbs form to measure 1 cup. Combine breadcrumbs, oil, and nutmeg; sprinkle over the sweet potato mixture. Bake for an additional 15 minutes or until golden. Let stand for 10 minutes before serving.