In a mixing bowl, combine the mashed potatoes, bacon, cheese, and egg.
Mix until ingredients are well blended.
Generously spray a mini muffin pan with cooking spray. Scoop out the potato mixture and press into the muffin pan, making sure to fill the holes and flatten the top.
Bake in a 400-degree oven for 35-40 minutes or until the paddy cupcake tops are golden brown.
While the paddy cake is cooling, prepare your sour cream. For a decorator’s touch, place the sour cream in an icing piping bag with a tip.
Decorate the muffin top as you would a cupcake with the sour cream. Sprinkle chives on top.