In a large bowl, combine the broccoli florets, crumbled bacon, shredded cheddar cheese, red onion, and sunflower seeds.
In a separate small bowl, whisk together the mayonnaise, apple cider vinegar, keto sweetener, salt, and black pepper until well blended.
Pour the dressing over the broccoli mixture and toss until all ingredients are evenly coated.
Cover the bowl and refrigerate for at least 1 hour to allow flavors to develop and broccoli to soften slightly.
Give the salad a final toss before serving.