Creamy Reuben Soup

Name: Creamy Reuben Soup
Ingredients: 1 large onion, chopped; 4 stalks celery, chopped; 1 red bell pepper, chopped; 1 cup butter; 2 cloves garlic, minced; 0.5 teaspoon dried tarragon; 0.5 teaspoon caraway seeds; 0.5 cup all-purpose flour; 4 cups beef stock; 1 quart half-and-half; 1 pound cooked corned beef, chopped; 1 cup sauerkraut; 1 teaspoon seasoned salt (such as Spice Islands® Beau Monde Seasoning); freshly ground black pepper to taste; 2.5 cups shredded Swiss cheese, divided; 1 (6 ounce) package rye croutons