Root Vegetable Casserole

Name: Root Vegetable Casserole
Ingredients: 1 large sweet potato peeled; 1 rutabaga peeled; 1 large onion peeled; 4 parsnips peeled; 2 yukon potatoes peeled; 2 cups kale cut into medium sized pieces; 2 cups collard greens cut into medium sized pieces; 3 1/2 cups grated cheddar cheese; 1 cup vegetable stock