01 - 
                Preheat your oven to 400°F (200°C).
              
              
              
                02 - 
                In a medium-sized mixing bowl, combine the cold mashed potatoes, garlic and herb cheese, 1 cup of shredded cheddar cheese, beaten eggs, Parmesan cheese, 1 tablespoon of chopped chives, garlic salt, and black pepper. Mix thoroughly until the cheese is evenly distributed and all ingredients are well combined.
              
              
              
                03 - 
                Liberally brush the cups of a standard 12-cup muffin tin with cooking spray or melted butter to prevent sticking.
              
              
              
                04 - 
                Use a 4 oz ice cream scoop to evenly divide the potato mixture between the muffin cups, filling each cup almost to the top.
              
              
              
                05 - 
                Sprinkle the tops of the puffins with the remaining 1/2 cup of shredded cheddar cheese for a cheesy crust.
              
              
              
                06 - 
                Place the muffin tin in the preheated oven and bake for 23-25 minutes, or until the puffins are set and the tops are golden brown.
              
              
              
                07 - 
                Once baked, run a knife around the edges of each puffin to loosen them from the tin. Serve immediately, either plain or with a dollop of sour cream or crème fraîche, and garnish with the remaining chopped chives.