In a large pot of salted boiling water, cook the shrimp until they turn pink and are cooked through, about 2-3 minutes. Drain and set aside to cool.
In a large bowl, combine the sliced cucumbers, diced avocados, red onion, and chopped cilantro.
In a separate small bowl, whisk together the olive oil, lime juice, Dijon mustard, garlic powder, salt, and pepper to make the dressing.
Add the cooked shrimp to the bowl of vegetables and pour the dressing over the salad. Toss gently to combine, ensuring all ingredients are coated in the dressing.
Taste and adjust the seasoning, adding more salt, pepper, or lime juice as desired. If you prefer some heat, sprinkle with red pepper flakes.
Serve the Keto Shrimp Avocado Cucumber Salad immediately or refrigerate for later use. The flavors will develop further as it sits.