Method:
Preheat oven to 350°F. Arrange shallots and squash on a large, parchment paper-lined baking sheet, drizzle with 1 tablespoon of the oil, season with 1/2 teaspoon salt and 1/4 teaspoon pepper and toss well. Roast, tossing occasionally, until just tender, about 40 minutes. Scatter panettone over the top and continue roasting until toasted and golden brown, about 15 minutes more.
Whisk together remaining 1 tablespoon oil, cider, lemon juice, 1/2 teaspoon salt and 1/8 teaspoon pepper in a large bowl. Add spinach and warm butternut squash, shallots and panettone and toss well. Transfer to a platter or large bowl and serve.