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