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Preheat oven to 400 degrees.
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Line baking sheet with parchment paper or Silpat.
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In the bowl of a stand mixer, combine sugar and softened cream cheese. Beat until smooth.
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Add egg yolks, ricotta cheese, vanilla extract, salt and lemon zest and mix until well combined.
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On a lightly floured surface, gently roll puff pastry sheet out to smooth the creases.
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Using a sharp knife, divide puff pastry into four squares.
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Spoon cream cheese filling onto each puff pastry square, dividing filling evenly between squares.
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Brush edges of puff pastry with egg wash and fold two corners in, making sure they over lap.
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Brush top of puff pastry with egg was and bake at for 18-20 minutes until golden brown.