Ingredients
- 2 tablespoons unsalted butter
- 2 tablespoons minced onion
- 1/4 cup all-purpose flour
- 2 cups whole milk
- Kosher Salt
- Freshly ground white pepper
- Pinch of nutmeg, optional
- 2 tablespoons Dijon mustard
- 12 slices thick-cut white bread
- 6 to 9 ounces sliced Gruyere (12 thin slices)
- 1 1/2 pounds thinly sliced ham
- 4 ounces (1 stick) unsalted butter
- 6 large eggs
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