For the potatoes and kielbasa
01 -
2 lb (900 g) Yukon gold potatoes, cut into 1/2-inch cubes
02 -
1 tablespoon kosher salt, for the boiling water
03 -
14 oz (400 g) smoked kielbasa, sliced into 1/4-inch rounds
04 -
1 tablespoon olive oil
05 -
1 small yellow onion, diced
06 -
1 red bell pepper, diced
07 -
2 cloves garlic, minced
08 -
1 teaspoon smoked paprika
09 -
1/2 teaspoon black pepper
For the cheese sauce
10 -
1 cup (240 ml) whole milk
11 -
1 tablespoon cornstarch
12 -
1/2 cup (120 g) sour cream
13 -
2 cups (225 g) shredded sharp cheddar cheese, divided
14 -
1/2 cup (55 g) shredded mozzarella cheese
15 -
2 tablespoons sliced green onions, for serving