You might not have thought to combine leeks and potatoes with cheese before, but once you try this dish, you'll wish you'd made it sooner! Alternate layers of cooked leeks with sliced potatoes in your baking dish. Combine heavy cream with a bit of salt and grated gruyere or swiss cheese, and pour over the veggies. Bake covered for 40 minutes at 350 °F, then uncover and bake for 15 to 20 minutes more. Tip: For those who like strong cheese, add a layer of camembert on top of your veggies before adding the cheesy cream mixture.