Ingredients

• 2 cups (about 8 1/2 ounces) all-purpose flour, plus more for work surface

• 1/2 teaspoon kosher salt

• 1 large egg, , lightly beaten

• 1/2 cup sour cream

• 1/4 cup unsalted butter, at room temperature

• 1 pound Yukon Gold potatoes, peeled and cut into 2-inch pieces (about 3 1/2 cups)

• 3 tablespoons unsalted butter

• 3 tablespoons sour cream

• 1/2 teaspoon kosher salt

• 1/4 teaspoon black pepper

• 6 ounces Cheddar cheese, shredded (about 1 1/2 cups)

• 4 slices bacon, chopped

• 2 tablespoons water

• 4 cups shredded green cabbage (from 1 medium head)

• 1/2 teaspoon kosher salt

• 1/4 teaspoon black pepper

• 1/4 cup unsalted butter

• Thinly sliced chives