In a small bowl, combine yogurt or mayonnaise with a pinch of salt. Whisk together until smooth and set aside.

Slice the onion thinly and soak in cold water for about 10 minutes to mellow its sharpness.

Cook short pasta according to package instructions until al dente, then drain and cool under cold water.

Halve cucumbers lengthwise, scoop out seeds, and slice into thin half-moons.

In a large mixing bowl, combine the cooled pasta, drained onion slices, and cucumber. Add any optional ingredients if desired.

Drizzle the creamy dressing over the mixture and toss gently to combine.

Chill in the refrigerator for at least 40 minutes before serving.