INGREDIENTS
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1 tablespoon olive oil plus additional for brushing baking pan and parchment paper
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1/2 lb turkey sausage, casings discarded (if necessary) and sausage coarsely crumbled
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2 large garlic cloves, chopped
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4 scallions, chopped
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1/2 lb fresh shiitake mushrooms, stems discarded and caps chopped
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1/2 lb fresh cremini mushrooms, trimmed and chopped
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1/4 teaspoon black pepper
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3/4 teaspoon salt
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1 (10-oz) package frozen chopped spinach, thawed and squeezed dry
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1/4 cup water
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2 large whole eggs
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4 large egg whites
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2 tablespoons fat-free (skim) milk
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1 oz finely grated Parmigiano-Reggiano (about 1/3 cup)
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3 oz Gruyère, coarsely grated (1 cup)