This beautiful and delicious scratch made cast iron skillet scalloped potato (potatoes au gratin) recipe is all about heavy whipping cream, Parmesan cheese, and a crispy browned top.
Butter a baking dish (this helps to brown the edges and prevent sticking). If using a 10 inch cast iron skillet wait on this step until the heated cream comes out of the pan.
Bring a pan to medium high heat and add the cream, 6 sprigs or so of thyme, bay leaves, salt, pepper, and nutmeg. Gently bring to a simmer, stirring occasionally.
Add ½ cup cream to the bottom of the baking dish or cast iron skillet and layer potatoes, spreading evenly. Add remaining cream to nearly cover the potatoes.