Sweet Potato and Kale Gratin

2-3 Large Sweet Potatoes - peeled.
1/2 bunch curly kale - chopped
Parmesan Cheese - grated
Milk - 1 cup
Olive Oil, Salt and Pepper

1.  Preheat oven to 400 degrees.
2.  Slice potatoes on a mandoline at 1/8 inch.  Toss with olive oil.
3.  Drizzle bottom of casserole dish with olive oil to prevent sticking.
4.  Place one layer of potatoes on bottom of dish.  Sprinkle with parmesan, salt and pepper.  Add a layer of kale and drizzle with olive oil.
5.  Place a second layer of potatoes, parmesan, salt, pepper and kale drizzled with olive oil.
6.  Place a third layer of potatoes.  Pour on one cup of milk (we usually have 1 or 2%).  Then sprinkle generously with parmesan, add salt and pepper to taste.
7.  Bake covered for 20 minutes.  Remove foil and bake an additional 20 minutes or until brown and bubbly.