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Ingredients

Serves 8

• 6 tablespoons unsalted butter, plus more for dish
• 1 medium onion, cut into 1/4-inch dice
• 1 red bell pepper, seeded and cut into 1/2-inch dice
• 1 pound button mushrooms, stems trimmed, quartered
• 2 teaspoons coarse salt
• 1/2 teaspoon freshly ground pepper
• 1 1/2 pounds green beans, trimmed and cut into 2-inch pieces
• 6 tablespoons all-purpose flour
• 2 cups milk
• 1 pinch cayenne pepper
• 1 pinch grated nutmeg
• 1 cup grated Parmesan cheese
• 1/4 cup breadcrumbs
• 1/4 cup canola oil
• 4 shallots, cut crosswise into 1/4-inch rings

Description

For This Gourmet Take On A Potluck Classic, The Casserole Is Assembled And The Shallots Are Cooked Ahead Of Time. Just Before Serving, Pop The Dish Under The Broiler For About 10 Minutes.

Martha Stewart