3 ina garten sour mashed potatoes Recipes

boiling potatoes, peeled, kosher salt, milk, unsalted butter, sour cream, freshly ground black pepper

white boiling potatoes, peeled and quartered, kosher salt, unsalted butter, half-and-half, sour cream, fresh ground black pepper, unsalted butter, chopped yellow onions (2 onions), all-purpose flour, kosher salt, fresh ground black pepper, chicken stock, preferably homemade, heated, cognac or 1 tbsp brandy, heavy cream (optional)