Step 1

Add the broccoli, the cauliflower, the red onion, and the cherry tomatoes to a salad bowl.

Step 2

In another bowl, whisk together the mayonnaise, the sour cream, and the sugar.

Step 3

Pour the dressing over the salad and toss to combine.

Step 4

Chill the salad for 1 hour.

Step 5

Serve.