These ham and cheese puff pastry squares are perfect for a lunch, dinner, or a party.
Roll out the puff pastry dough. Brush the mustard all over the surface. Place the ham slices on one side, then sprinkle with cheese.
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Fold the other half of the pastry on top of the ham and cheese, then crimp the edges. Move the pastry to a baking sheet and brush the surface with beaten egg yolk.
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Bake and let cool before slicing and serving.
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