To make the dressing, whisk together 1 cup mayonnaise, 3 tablespoons apple cider vinegar, 1½ tablespoons granulated sugar, ¼ teaspoon salt, and ¼ teaspoon ground black pepper in a small bowl. Place in the refrigerator to chill while you prepare the salad.
In a skillet over medium-high heat, cook the chopped 4 strips bacon until crispy, about 8 to 10 minutes.
Add the cooked bacon, 8 cups broccoli florets (chopped), ½ cup dried cranberries⅓ cup red onion (diced), and ⅓ cup sunflower seeds to a large mixing bowl and mix together.
Pour the dressing over the broccoli mixture and toss until evenly coated.
Chill the salad in the refrigerator for at least 1 hour. Then, serve cold and enjoy!