Ingredients: For the Potato Cheese Filling: 2 lbs (900 g) russet potatoes, peeled 1/2 tsp salt 2 Tbsp (30 g) unsalted butter, melted 2 oz (55 g) cream cheese, softened 3/4 cup (180 g) mozzarella cheese, shredded For the Pierogi Dough: 1 cup (240 ml) warm water 1/4 cup (60 ml) whole milk 2…