Ingredients
- 3 tablespoons unsalted butter, plus more for greasing
- 2 tablespoons freshly grated Parmigiano-Reggiano cheese
- 3 1/2 tablespoons all-purpose flour
- 1 cup cold whole milk
- 5 large eggs, separated
- 1/2 teaspoon kosher salt
- 1/2 teaspoon freshly ground pepper
- 3 ounces Gruyère cheese, shredded (1 cup)
- 2 tablespoons chopped chives
- 2 slices of yellow American cheese, each cut into 6 strips
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