Sweet Potato, Potato and Onion Casserole

The onions absorb incredible flavor in this dish, but I had trouble getting the top layer of potatoes to cook through. Possibly because I forgot to cover it the first 30 min of baking or maybe because I didn't add enough water or because I added the cheese later. But it still turned out delicious and I would make it again.

• 1 large sweet potato, thinly sliced
• 3 small potatoes, very thinly sliced
• 1 onion, very thinly sliced
• 4 T butter
• salt and pepper
• 2 T flour
• 3/4 c broth
• 1 c shredded mozzarella

1. Preheat oven to 180C. Grease an 8x8 baking dish.
2. Make a layer of potatoes. Place some onion slices on top. Dot with butter. Sprinkle with salt and pepper.
3. Repeat, alternating layers of sweet potatoes and potatoes.
4. In a small bowl, combine broth and flour. Pour over potatoes.
5. Dot with butter.
   
6. Sprinkle cheese over the potatoes.
7. Cover with foil.
8. Bake for 1 hour or until potatoes are cooked through.

Variations

• Put cheese in with every layer.
• Add breadcrumbs and dried parsley on top before baking.
• Use a different kind of cheese: cheddar, Swiss, Monteray Jack, etc