Sprinkle the remaining 2 tablespoons grated Parmesan over the top. Cover the dish tightly with foil so the potatoes can steam and soften without drying out.
Bake until tender: Place the covered glass casserole dish on the middle rack of the preheated oven. Bake for 45–55 minutes, or until the potatoes are fork-tender when you poke the center with a knife.
Brown the top: Remove the foil and continue baking for another 15–20 minutes, or until the top is bubbly, lightly golden, and the edges are browned and crisp in
