Onion Mushroom Gratin

Onion Mushroom Gratin was pinched from <a href="http://goboldwithbutter.com/?p=3116" target="_blank">goboldwithbutter.com.</a>
INGREDIENTS
4 tablespoons butter
2 onions, peeled and thinly sliced
8-ounces sliced mushrooms
1 clove garlic
salt and pepper
3 pounds Yukon Gold potatoes, peeled and thinly sliced
4 cups cheese, grated and divided (Gruyere, Fontina, Cheddar, Emmental all are great)
2 1/2 cups heavy cream
2 teaspoons fresh thyme leaves
1/4 teaspoon ground nutmeg
1/4 cup flat leaf parsley, chopped
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