Cut premade, thawed puff pastry into squares, ready to make your ham and cheese puff pastry appetizers.
Combine honey and mustard in a small bowl and mix until smooth.
Spread the honey and mustard mixture onto the pastry, leaving a border.
Arrange ham, asparagus and cheese on top of the mustard. Fold pastry sides toward the center.
Lay all the ham and cheese pastries on a lined baking pan and brush with beaten egg yolk.
Cook ham and cheese puff pastry until flaky and golden all over, about 18 minutes. Serve warm.