Preheat oven to 375°F (190°C) and grease a muffin tin with cooking spray.
Boil potatoes in salted water until fork-tender, about 15 minutes. Drain and mash.
Stir in butter, heavy cream, cheddar cheese, Parmesan cheese, garlic, salt, pepper, and paprika.
Allow the mixture to cool slightly, then add the beaten eggs and mix well.
Spoon the mashed potato mixture into the muffin tin, filling each cup evenly.
Bake for 25-30 minutes or until golden brown and slightly crispy on the edges.
Remove from oven, garnish with chopped chives, and serve warm.