Grated Parmesan cheese gives these roasted potatoes a lovely crisped exterior. I found that spreading the Parmesan-butter mixture directly onto the crosshatched potatoes helped it to stick better than doing it the way you see all over TikTok (spreading the parmesan mixture in an even layer on the bottom of the baking pan and placing the potatoes on top).
For optimal crispness, ensure potatoes are thoroughly dry before scoring. Using freshly grated Parmesan cheese makes a significant difference in flavor and crust formation compared to pre-grated. When mixing the Parmesan paste, allow the melted butter to cool slightly to prevent the cheese from clumping or burning too quickly. Do not overcrowd your baking dish; give the potatoes space to roast rather than steam, ensuring a golden, crispy crust. A final sprinkle of fresh parsley or chives after baking adds a nice aromatic finish.