Polish Pasta Casserole

INGREDIENTS:

4 cups uncooked short pasta, such as penne or fusilli

2 tablespoons butter

2 tablespoons all-purpose flour

2 1/2 cups milk

1 cup sour cream

2 tablespoons Dijon mustard

1 teaspoon garlic powder

1 (16 oz) jar sauerkraut, rinsed and well-drained

1 1/2 lbs smoked Polish sausage or kielbasa, sliced 1/2-inch thick

3 cups Swiss cheese, grated and divided

4 green onions, chopped

Kosher salt and freshly ground black pepper, to taste

DIRECTIONS:

Preheat oven to 350°F and grease a 9×13-inch baking dish with butter or nonstick spray.

In a large pot of salted water, cook pasta according to package directions. Drain and set aside in a large bowl.

In a large saucepan, melt the butter over medium heat. Whisk in the flour and let cook 1 minute, stirring constantly.

Gradually whisk in milk, stirring constantly, and cook until thickened. Remove from heat, stir in garlic powder, Dijon mustard, and sour cream, and season with salt and pepper …