Upgrade Your Thanksgiving Green Bean Casserole Recipe | America's Test Kitchen

Ingredients

• 4 slices white sandwich bread , each slice torn into quarters
• 2 tablespoons unsalted butter , softened
• 1/4 teaspoon table salt
• 1/8 teaspoon ground black pepper
• 3 cups canned fried onions (about 6 ounces)
• Table salt
• 2 pounds green beans , ends trimmed, and halved
• 3 tablespoons unsalted butter
• 1 pound white button mushrooms , stems trimmed, wiped clean, and broken into 1/2-inch pieces (see illustrations below)
• 3 medium cloves garlic , minced or pressed through garlic press (about 1 tablespoon)
• Ground black pepper
• 3 tablespoons unbleached all-purpose flour
• 1 1/2 cups low-sodium chicken broth
• 1 1/2 cups heavy cream