Ingredients
- 6 tablespoons unsalted butter (3 ounces), plus additional to butter a 6-cup gratin dish
- 6 tablespoons all-purpose flour
- 2 cups whole milk
- 3/4 teaspoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 5 large eggs
- 10 ounces grated Swiss cheese, preferably Gruyère (about 2 1/2 cups)
- 3 tablespoons minced chives
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