INGREDIENTS
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cooking spray
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1/2 cup butter
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1 large onion, diced
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3 stalks celery, diced
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1 teaspoon salt, or to taste
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1/2 teaspoon freshly ground black pepper, or to taste
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1/2 teaspoon dried sage
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1/2 teaspoon dried thyme
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1/2 teaspoon dried rosemary
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1 pinch cayenne pepper, or to taste
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2 3/4 cups chicken broth
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1 pound saltine crackers, crushed
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1/2 cup milk
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1 egg