In a large mixing bowl, combine the broccoli florets, cauliflower florets, diced red onion, shredded cheddar cheese, and cooked bacon pieces.
In a separate bowl, whisk together the Miracle Whip, granulated sugar, and apple cider vinegar until smooth and well-blended.
Pour the dressing over the salad ingredients and fold gently until everything is evenly coated.
Refrigerate for at least an hour to allow the flavors to meld. This salad will stay fresh in the refrigerator for 5-6 days.