Prepare a baking sheet pan by lining with parchment paper or a silicone baking mat.
Note - the following instructions are for using a 10-ounce box of Pepperidge Farms puff pastry shells. If using a different brand, follow instructions on their box.
Preheat oven to 425℉ (220℃)
Remove frozen puff pastry shells from packaging.
Break along scored lines to separate the shells. Place on prepared baking sheet.
Bake in preheated oven for 18-20 minutes. Pastries will be puffed and golden brown.
Cool on pan for 5 minutes. Use a knife to remove the middle to create a well in center of the pastry.
Fudge filling
Place chocolate in a large heat-resistant bowl.
Combine heavy cream and corn syrup in a microwave safe dish. Place in microwave and bring to a low boil. (alternatively, heat in a saucepan over your stove top).
Pour cream/corn syrup over chocolate. Let stand for 5 minutes, then whisk until smooth.
Add softened butter to bowl. Stir until smooth.
Allow icing to sit at room temperature and cool until it is firm enough to spread or pipe (approximately ½ hour).
Assembly
Pipe or spoon fudge icing into the well of each puff pastry shell.
Place 3 - 4 candy eggs on top of fudge icing. Optional - add colorful sprinkles.