"Note: The topping and casserole can be frozen separately for up to 2 months. Hallelujah!..."
INGREDIENTS
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2 slices hearty sandwich bread, white or wheat, torn into pieces
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2 tablespoons unsalted butter , melted
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1/4 teaspoon salt
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2 cups canned fried onions
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3 tablespoons unsalted butter
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10 ounces white mushrooms , sliced thin
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1 teaspoon salt
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1/2 teaspoon pepper
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6 garlic cloves , minced
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1/2 teaspoon dried thyme
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1/4 cup all-purpose flour
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1 3/4 cups low-sodium chicken broth
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1 1/2 cups heavy cream
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2 pounds fresh green beans, trimmed and cut into 1-inch pieces
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1/4 cup cornstarch