In a large mixing bowl, combine the shredded green cabbage, red cabbage, shredded carrots, and chopped 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 everything is well coated. Serve immediately or refrigerate for 30 minutes to allow the flavors to meld.