2 pounds russet potatoes (about 4 medium), peeled and cut into 1-inch pieces
1 teaspoon kosher salt, plus more as needed
1/4 cup low-fat milk
3/4 cup buttermilk
2 teaspoons finely chopped dill
1 teaspoon thinly sliced chives
Freshly ground black pepper
Do not heat the low-fat milk and buttermilk before adding to the potatoes or they will curdle.