Make the dressing: In a large mixing bowl, whisk together the greek yogurt, olive oil, apple cider vinegar, lime juice, and taco seasoning until smooth.
Add the cabbage, bell peppers, black beans, corn, green onion, cilantro, and jalapeno pepper (if using) to the bowl. Mix until the ingredients are evenly distributed and coated in the dressing. If using, mix in the cheese.
Enjoy immediately with diced avocado on top or refrigerate in sealed containers for up to 4 days.
