Leek, Potato, and Bacon Casserole

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2 leeks, white and light green (about 6 ounces)

6 slices smoked bacon

1 tablespoon unsalted butter, plus for brushing the pan

3 teaspoons kosher salt

Freshly ground black pepper

2 medium red potatoes, diced (about 8 ounces or 2 cups)

2 cloves smashed garlic

2 sprigs fresh thyme

6 large eggs, beaten

1 1/2 cups half-and-half

6 ounces Jarlsberg Swiss cheese, grated (about 2 cups)

1/2 teaspoon freshly grated nutmeg