2 Tbsp fresh parsley, chopped (plus more for garnish on top)
1 tsp fresh rosemary, chopped
Parmesan cheese
1 tsp sea salt and ground pepper
Directions
Preheat oven to 350. Saute diced onion in a bit of butter until soft. Set aside. Thinly slice potatoes or use a mandolin. In a small sauce pan, melt 2 Tbsp butter. Stir in flour until you make a roux. Once melted, add stock, a little at a time, stirring constantly, until sauce thickens. Cook for about 5 minutes then add herbs, cooked onions, salt and pepper (adjust salt, to taste). In a medium cast-iron skillet, lay out the potatoes evenly, making layers. Pour some sauce and a sprinkle of Parmesan cheese between each layer. Top the final layer with remaining sauce and Parmesan cheese and bake for 20-25 minutes or until potatoes are cooked through and golden brown. Top with chopped parsley before serving.