These little appetizers are great for a small dinner party - they are cute and very easy to make. You can double the recipe with no problem - simply boil up extra potatoes and have extra toppings on hand. If you want the sour cream to look especially fancy, try using an icing decorator tube or simply put the sour cream into a ziploc baggie and cut a tiny hole in one corner. For a real splurge, omit olive and sprinkle with caviar instead. Prep time includes time to boil the potatoes.