With whisk, stir in taco seasoning mix. Stir in black beans and corn. Increase heat setting to High; cover and cook 15 to 30 minutes longer or until thickened. Note: This recipe was tested in slow cookers with heating elements in the side and bottom of the cooker, not in cookers that stand only on a heated base. For slow cookers with just a heated base, follow the manufacturer’s directions for layering ingredients and choosing a temperature.