Croque Monsieur Soup

Name: Croque Monsieur Soup
Ingredients: 1/2 cup butter; 2 large sweet onions, cut in half and thickly sliced (4 cups); 2 teaspoons finely chopped garlic; 1/4 cup all-purpose flour; 3 cups Progresso™ unsalted chicken broth (from 32-oz carton); 1 package (8 oz) cream cheese, cut in cubes; 2 cups half-and-half; 2 1/2 cups shredded Swiss cheese or Gruyère cheese (10 oz); 2 cups chopped cooked ham (about 10 oz); 3 teaspoons Dijon mustard; 1/2 teaspoon salt; 8 slices (1-inch thick) French bread; Cornichons, if desired