INGREDIENTS
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5 smoked bacon slices
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1 red onion, sliced
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3/4 cup heavy cream
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1/4 teaspoon kosher salt
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1/4 teaspoon black pepper
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3 large eggs, lightly beaten
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1/2 (17.3-oz.) package frozen puff pastry sheets, thawed
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1 1/2 cups (6 oz.) freshly shredded Swiss cheese, divided
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1 cup coarsely chopped green onions
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1/3 cup grated Parmesan cheese
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1 large egg yolk
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2 tablespoons milk
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