Toss cucumbers with ½ teaspoon kosher salt in a colander and set aside to drain while you prepare the other ingredients.

Finely chop the peanuts, cilantro, and red pepper flakes together until well mixed. Set aside.

In a large bowl, whisk together the peanut butter, soy sauce, rice vinegar, sugar, garlic, and ½ teaspoon kosher salt. Whisk in a little water (up to 1 tbsp) to thin the dressing if needed.

Add the drained cucumbers to the dressing and toss to coat well.

To serve: spoon half the dressed cucumbers onto a plate and sprinkle with half of the peanut mixture. Repeat with the remaining cucumbers and peanut mixture.

Drizzle with chile oil if using and serve immediately.