In a large bowl toss the green and red cabbage with the shredded carrots.

In a small bowl combine the mayonnaise, vinegar, olive oil, sugar, poppy seeds, celery salt, white pepper, and mustard powder.

Gently stir the blue cheese into the mayonnaise mixture.

Pour the mayonnaise and blue cheese mixture over the cabbage and carrots and mix to combine.

Serve with additional blue cheese crumbled on top if desired.