In a large bowl, combine the diced cucumber, halved cherry tomatoes, diced bell pepper, thinly sliced red onion, corn kernels, and chopped fresh parsley.
In a small bowl, whisk together the olive oil, lemon juice, Dijon mustard, salt, and black pepper to create the dressing.
Pour the dressing over the vegetable mixture and toss gently to combine.
Serve immediately or chill for later. Enjoy!
Notes
This salad is very versatile. Feel free to add other vegetables like zucchini, avocado, or even some grilled chicken or chickpeas for a more substantial meal.