Step 1

Pop the popcorn in a popcorn popper according to the manufacturer's instructions. While still hot, sprinkle with the white cheddar popcorn seasoning to taste. Let cool completely.

Step 2

Whisk the mayonnaise, sour cream, cider vinegar, sugar, and Dijon together in a large serving bowl. Stir in the shallot. Season with salt and pepper.

Step 3

Add the snap peas, carrot, and chopped celery and toss to coat. Add the popcorn and toss to coat the kernels in the dressing.

Step 4

Pile the watercress on top and sprinkle with the celery leaves. Serve immediately and enjoy!