Begin by thinly slicing the cucumbers and onion. Place the cucumber slices in a colander, sprinkle with salt, and let them drain for about 10 minutes. Rinse and pat dry.

In a medium microwave-safe bowl, soften the cream cheese in the microwave for 20-30 seconds. Whisk in mayonnaise, soy sauce, rice vinegar, and sesame oil until smooth.

In a large mixing bowl, combine the drained cucumbers and sliced onions. Pour half of the dressing over them, mix gently, and let sit for 5 minutes.

Drizzle the remaining dressing over the mixture and toss in any optional ingredients like shrimp or diced avocado. Combine gently.

Transfer to a serving dish and garnish with sesame seeds or green onions. Serve immediately.