Scalloped Potatoes with Onions and Cheddar Cheese

Scalloped Potatoes with Onions and Cheddar Cheese was pinched from <a href="http://www.thekitchn.com/recipe-scalloped-potatoes-with-onions-and-cheddar-cheese-recipes-from-the-kitchn-195595" target="_blank">www.thekitchn.com.</a>
INGREDIENTS
2 tablespoons unsalted butter
1 medium onion, thinly sliced
4 cups whole milk (or 2 cups milk and 2 cups water)
2 to 3 garlic cloves, smashed
1 heaping teaspoon Dijon mustard (or dry mustard powder)
2 1/2 pounds (about 6 medium) baking potatoes, peeled
1 1/2 cups grated cheddar cheese, divided
3/4 cup heavy cream
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