Fresh Green Bean Casserole

INGREDIENTS

• :
• 4 slices white bread, each slices torn into quarters
• 2 tablespoons unsalted butter, softened
• ¼ teaspoon salt
• 1/8 teaspoon ground black pepper
• 3 cups canned fried onions (about 6 ounces)
• 2 tablespoons salt
• 2 pounds green beans, ends trimmed, and halved
• 3 tablespoons unsalted butter
• 1 pound white button mushrooms, stems removed, wiped clean and broken into ½-inch pieces
• 3 cloves garlic, minced (about 1 tablespoon)
• Salt and pepper, to taste
• 3 tablespoons all-purpose flour
• 1½ cups chicken broth
• 1½ cups heavy cream