Preheat oven to 400 degrees F. Break apart Pepperidge Farm Puff Pastry Cups onto a cookie sheet lined with parchment paper.
Brush each frozen cup with the beaten egg (also called an "egg wash") which helps give the cups a golden brown color once baked.
Bake Pepperidge Farm Puff Pastry Cups for 14-16 minutes or until golden brown (all ovens can vary so watch carefully for the golden brown color).
In a saucepan over medium-heat, bring heavy cream to a boil.
in a separate heat-proof bowl filled with chopped chocolate, carefully pour in boiling heavy cream. Stir until thoroughly mixed. Add butter and continue to stir.
After Puff Pastry Cups are removed from oven, use the end of a wooden spoon to push in the center of the "cup" to create a hole for filling with chocolate ganache!
Dip each Pastry Cup into the chocolate ganache and add in extra to the center cup with a spoon.