2 1/2 tablespoons butter
2 Bay leaves
1 large onion, sliced somewhat thickly (about 1/4 inch thick)
1 lb. potatoes, washed and very thinly sliced
2 tablespoons olive oil
1/2 cup grated gruyère
1 cup grated mozzarella
salt and black pepper
Preheat oven to 400°. Melt the butter in a 9-10 inch ovenproof frying pan (cast iron is great) over medium heat. Add Bay leaves and onion and cook for 5 minutes. Place the potato, oil, Gruyère, mozzarella, salt and pepper in a bowl and toss to combine.
Remove the Bay leaves. Top the onion with the potato mixture and bake for 45 minutes or until golden brown and cooked through. Turn upside down to serve.
(recipe from Hizzoner's Deli.)