Wash and dry the broccoli thoroughly. Chop it into small, bite-sized florets and place them in a large mixing bowl.
Add the Mix-Ins
To the broccoli, add shredded cheddar cheese, red onion, dried cranberries, and sunflower seeds.
Make the Dressing
In a small bowl, whisk together mayonnaise, white vinegar, and sugar until smooth and creamy.
Combine and Toss
Pour the dressing over the broccoli mixture. Toss until everything is evenly coated.
Chill Before Serving
Cover the salad and refrigerate for at least 1 hour before serving to allow the flavors to meld.
Serve
Give the salad a quick stir and serve it chilled as a side dish or light meal.