Cook pasta until al dente. Drain, reserving 1 cup cooking water. In same pot, cook bacon until just crisp; transfer to paper towels. Add sage to hot bacon fat and cook until crisp, 2 to 3 minutes. Transfer to plate. Add shallots and apple and cook, 5 minutes. Add pasta, squash, cooking water, bacon and parmesan; season with salt and pepper and toss. Top with crumbled sage and parsley.
