In a large mixing bowl, combine the chopped broccoli, crumbled bacon (if using), chopped red onion, slivered red cabbage, and shredded carrots. Mix well.

In a separate small bowl, whisk together the Dijon mustard, olive oil, honey, apple cider vinegar, minced garlic, salt, and pepper until smooth.

Pour the dressing over the salad mixture and gently toss to coat evenly.

Let the salad chill in the refrigerator for at least 1 hour before serving.

Serve the salad cold, optionally garnished with additional bacon bits or sunflower seeds.