In a large mixing bowl, combine the shredded green cabbage, shredded carrots, shredded red cabbage, and sliced green onions.

In a separate bowl, whisk together the Greek yogurt, apple cider vinegar, honey, Dijon mustard, salt, and black pepper until smooth.

Pour the dressing over the vegetable mixture and toss until all the vegetables are well coated.

Chill in the refrigerator for at least 30 minutes before serving to allow flavors to meld.