INGREDIENTS
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1 (10 oz) package frozen chopped spinach, thawed
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1/2 cup shredded Gruyere cheese
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1/4 cup grated Parmesan cheese
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1/2 teaspoon salt
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1/2 teaspoon black pepper
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1/8 teaspoon garlic powder
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1 large egg
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1 tablespoon water
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1 sheet puff pastry, thawed