"Because grown-ups need powdered sugar, too...."
INGREDIENTS
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4 large eggs
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1/4 cup half-and-half
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1/2 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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8 slices sturdy white or sourdough bread
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1/4 cup Dijon mustard
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1/4 cup mayonniase
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8 ounces Gruyère cheese, grated
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1 pound sliced honey ham
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4 tablespoons unsalted butter, divided
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Powdered sugar and ham, for serving (optional)