INGREDIENTS
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1 (1-pound) day-old sourdough boule, cut into 1-inch cubes
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4 large eggs
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3 1/2 cups whole milk, or any combination of milk and cream
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1/2 teaspoon ground nutmeg
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1/2 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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1 cup caramelized onions
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1 1/2 cups shredded provolone cheese, divided
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8 ounces thick-cut ham, cut into 1/2-inch cubes
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2 tablespoons thinly sliced fresh chives, for garnish