Absolutely amazing! My daughter nearly ate everything that was left when she got home after the rest of us had eaten. Flavor is really satisfying, almost in a meat-y sort of way. The flavor from this combination is something you could not imagine from each individual ingredient's flavor alone. Definitely use shaved parmesan, not the powdery kind. I cut my sweet potatoes in couple-inch-long hunks instead of leaving whole. Topped with the onions and cheese and popped back in oven to get all melty.