Potato Cauliflower Chowder

Name: Potato Cauliflower Chowder
Ingredients: 1 large onion, chopped; 2 tablespoons butter; 4 cups chicken broth or 4 cups vegetable broth; 2 cups yukon gold potatoes or 2 cups white potatoes, peeled; 2 1⁄2 cups cauliflower florets; 1 cup half-and-half or 1 cup light cream or 1 cup milk; 2 tablespoons flour; 2 1⁄2 cups shredded swiss cheese (10oz); salt; pepper