In a large mixing bowl, combine the diced cucumber, halved cherry tomatoes, sliced red onion, diced bell peppers, and whole kalamata olives.
Toss the ingredients gently to combine and distribute them evenly throughout the salad.
In a small bowl, whisk together the extra-virgin olive oil, red wine vinegar, lemon juice, dijon mustard, italian seasoning, salt, and pepper. Whisk until the ingredients are well combined and the dressing has emulsified.
Drizzle the dressing all over the top of the salad, starting with a small amount and adding more as desired. Toss the salad gently to coat the vegetables with the dressing.
Sprinkle the crumbled feta cheese over the salad, evenly distributing them for a burst of flavor and freshness.
Transfer the Keto Greek Salad to individual serving plates or bowls.
Serve immediately as a light and refreshing main course or as a side dish to complement your keto-friendly protein options like grilled chicken, fish, or shrimp.