In a large mixing bowl, combine chopped broccoli, cauliflower, cheese, red onion, sunflower seeds, and crumbled bacon.
In a separate bowl, whisk together mayonnaise, sour cream, apple cider vinegar, sweetener, salt, and pepper.
Pour the dressing over the salad mixture and toss until everything is well coated.
Refrigerate for at least 1 hour before serving to let the flavors meld.
Serve chilled and enjoy!