Cheesy mashed potatoes au gratin✨

1. Preheat the oven to 400F.
2. Place the potatoes in a medium pot and cover with water by 1-2 inches. Bring to a boil over high heat, then reduce the heat to medium low. Simmer the potatoes until they can be easily pierced with a fork, 20-25 mins.
3. Drain the potatoes into a colander. Add the milk, butter, salt, and pepper to the hot pot and stir until the butter melts. Rice the potatoes back into the pot using a potato ricer (or mash directly with a masher). Add the Parmesan and stir until smooth and combined. Taste and adjust seasoning if desired.
4. Spread the potatoes into a baking dish and top with the shredded Gruyere.
5. Place on a baking sheet and bake until the top is golden and bubbling, 20-25 mins. Top with chopped parsley and enjoy!