Storage: Store the soup base (without pasta) in an airtight container in the refrigerator for up to 5 days, or freeze for up to 3 months. Store cooked pasta separately in the fridge for up to 3 days and add to reheated soup when serving. Thickening tip: For a thicker, creamier broth, mash or blend about 1 cup of the cannellini beans before adding to the slow cooker, or blend a ladle of the finished soup and stir it back in. Slow cooker sizes: This recipe works best in a 6-quart or larger slow cooker. Make it vegetarian: Omit the ground beef, use vegetable broth, and add an extra can of beans plus diced zucchini or baby spinach stirred in during the last 30 minutes.