Step 1

Preheat the oven to 350 degrees F.

Step 2

Grease two 8-inch baking dishes.

Step 3

Cook the pasta to al dente according to the package directions.

Step 4

Drain the pasta and transfer it to a large bowl.

Step 5

Stir the sausage, condensed cream of mushroom soup, sauerkraut, 2 cups cheese, milk, onions, dijon mustard, and garlic into the pasta.

Step 6

In the prepared baking dishes, spoon in the sausage mix.

Step 7

Sprinkle the top with the remaining 1 cup of Swiss cheese.

Step 8

Bake, uncovered, until golden brown and bubbly, about 45-50 minutes.

Step 9

Serve.