Leftover mashed potatoes get a new lease on life thanks to these puffs! They're combined with eggs, sour cream, cheese and chives then baked in a cupcake pan until golden and crusty with creamy middles. They don't taste like leftovers.
1/3 cup sour cream, plus more for serving
1 heaping cup shredded sharp cheddar cheese
2 tablespoons grated Parmesan
2 tablespoons chopped chives
salt and black pepper, to taste
3 cups mashed potatoes