Yukon Gold Potato Gratin
2 lbs. Yukon Gold potatoes, thinly sliced
1 Granny Smith green apple, peeled and grated
3 leeks (white and pale green parts only), halved lengthwise
3 Tbsp. extra-virgin olive oil
1 cup Gruyere cheese, grated
Coarse salt and freshly ground pepper
*Preheat oven to 400 degrees.
Brush 1 Tbsp. olive oil in 9×12” oval baking dish. Slice leeks 1/8” and separate; set aside. Spiral potato slices around dish. Top with grated apple and leeks. Drizzle 2 Tbsp. olive oil over potatoes. Season to taste with salt and pepper.
Cover with foil. Bake 20 minutes. Remove foil and top with Gruyere cheese. Re-cover dish loosely with foil. Bake 20 minutes; remove foil. Bake another 5 minutes until cheese is lightly browned.