Ingredients
- 4 (1/2-inch-thick) good-quality firm white sandwich bread slices
- 3 tablespoons unsalted butter, softened, divided
- 1 tablespoon all-purpose flour
- ¾ cup whole milk
- 4 ounces Gruyère cheese, grated on small holes of box grater (about 1 cup), divided
- ½ teaspoon kosher salt
- ¼ teaspoon black pepper, plus more for garnish
- ¼ teaspoon ground nutmeg
- 4 slices cooked unsmoked ham (3 ounces total; such as jambon de Paris)
- 1 tablespoon Dijon mustard
- 2 large eggs
- Chopped fresh chives
- Flaky sea salt
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