Broccoli Cauliflower Salad

1 cup cauliflower, chopped
1 cup broccoli, chopped
¼ cup raisins
3 tsp red onion, diced
2 tsp bacon bits (optional)
¼ cup sunflower seeds

Dressing
1 tablespoon sugar
3 tablespoons mayonnaise
1 tablespoon milk
2 tsp white wine vinegar
¼ cup Parmesan cheese, grated