Break the head of cauliflower up into chunks and cut into desired sized pieces.
Add all the cauliflower to a microwave safe bowl and cover bowl with damp paper towels. Microwave on high for 3 minutes. Re-dampen the paper towels and microwave for another 3 minutes or until cauliflower is fork tender.
Dice the bacon, hard boiled eggs, celery, red onion and chives and add it to the bowl of cauliflower.
In a separate bowl combine the mayo, mustard, apple cider vinegar, salt and black pepper and then pour it over the cauliflower mixture.
Combine the entire mixture thoroughly with a spoon and add any additional salt and pepper as you see necessary.
Store in a sealed container in the fridge up to one week. Serve cold and enjoy!