INGREDIENTS
1 cup
Russet potato
1/4 cup
Scallions
1
Egg, large
1
Egg yolk, large
1/2 cup
All-purpose flour
1 tsp
Baking powder
1/2 tsp
Pepper, freshly ground
2 tsp
Salt, coarse
1
Salt and freshly ground black pepper, Coarse
8 tbsp
Butter, unsalted
1/4 cup
Milk
1 cup
Milk or cream
2 pounds russet, Yukon gold, or long white potatoes, peeled