INGREDIENTS
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2 teaspoons olive oil
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1/3 cup chopped Vidalia onion
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2 cups sliced mushrooms
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4 cups packed baby spinach leaves or torn Swiss chard
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2 large eggs
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4 large egg whites
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1/2 cup shredded smoked Gouda cheese, divided
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1/4 teaspoon salt
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1/4 teaspoon pepper
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Cooking spray