Make-Ahead Green Bean Casserole Recipe | Say Mmm

Ingredients

• 2 slices hearty sandwich bread, white or wheat, torn into pieces
• 2 tablespoons unsalted butter, melted
• 1/4 teaspoon salt
• 2 cups canned fried onions
• 3 tablespoons unsalted butter
• 10 ounces white mushrooms, sliced thin
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 6 garlic cloves, minced
• 1/2 teaspoon dried thyme
• 1/4 cup all-purpose flour
• 1 3/4 cups low-sodium chicken broth
• 1 1/2 cups heavy cream
• 2 pounds fresh green beans, trimmed and cut into 1 inch pieces
• 1/4 cup cornstarch