Mashed Potato Gratin – the ultimate comfort food side! Creamy mashed potatoes topped with jammy caramelized onions and thinly sliced potatoes under a blanket of grated cheese. This impressive, indulgent side dish, inspired by Chef John’s mashed potato au gratin, is sure to be a hit with everyone.
This video originally appeared on French Onion Mashed Potato Gratin.
