Peel the potatoes and boil them in lightly salted water.
Mash the boiled potatoes until smooth. Add the egg, butter, and parmesan cheese to the mashed potatoes, season with salt and pepper, and mix well. Spoon the mixture into a piping bag with a star-shaped nozzle.
Line a baking tray with parchment paper and pipe a 3-inch-wide spiral on the pan. Continue piping the mashed potato mixture higher on the swirl to create a nest with a well inside. Repeat this 5 more times until you have 6 potato nests.
Fill the potato nests with the Swiss cheese and bacon cubes and sprinkle parmesan cheese on top. Transfer the baking tray to a preheated oven and cook at 375°F for 20 minutes.
Notes
Of course, you can prepare these hearty cheese nests with a different filling – let your inventiveness know no bounds, and above all, enjoy!