Ingredients

• 8 medium bunches scallions, cut crosswise into 1-inch pieces (about 16 cups)
• 2 garlic cloves, minced
• 3 tablespoons unsalted butter
• 1/4 cup heavy cream
• 1/2 cup freshly grated Parmesan
• 1 tablespoon olive oil
• 2 cups fresh bread crumbs

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Instructions

1. Preheat oven to 350°F. and butter a 1 1/2-quart shallow baking dish.
2. In a kettle cook scallions and garlic in butter over moderate heat until scallions are softened, about 20 minutes. Stir in cream and 1/4 cup Parmesan and transfer to baking dish.
3. In a skillet heat oil over moderately high heat until hot but not smoking and sauté bread crumbs, stirring, until golden brown, about 3 minutes. Transfer bread crumbs to a bowl and cool. Add remaining 1/4 cup Parmesan and season with salt and pepper. Top casserole with bread crumb mixture. Casserole may be prepared up to this point 1 day ahead and chilled, covered. Bring casserole to room temperature before proceeding. Bake casserole, uncovered, in middle of oven until hot, 15 to 20 minutes.