Reuben Mac and Cheese recipes

Name: Reuben Mac and Cheese recipes
Ingredients: 6 rye crispbread crackers; 1/4 cup fresh parsley leaves; 8 ounces short cut pasta, I used medium shells; 3 tablespoons butter, separated; 2 tablespoons all-purpose flour; 1 1/2 cups milk; 2 tablespoons spicy brown deli mustard; 1 teaspoon prepared horseradish; kosher salt; cracked black pepper; 1 cup shredded Swiss cheese; 1/2 cup medium cheddar, shredded; 1/2 pound slow cooker corned beef, shredded or chopped; 1/2 pound sauerkraut, rinsed and well drained