INGREDIENTS
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10 cups day-old challah or brioche, cut into 1-inch cubes (from 1 or 2 loaves)
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1/2 cup packed fresh parsley, coarsely chopped
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1/4 cup packed fresh sage, coarsely chopped
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2 tablespoons fresh thyme, coarsely chopped
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4 tablespoons unsalted butter, plus more for dish
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4 stalks celery, chopped
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3 garlic cloves, minced
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Coarse salt and freshly ground pepper
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2 bunches scallions, thinly sliced
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8 large eggs, lightly beaten
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2 cups chicken stock
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2 cups heavy cream