Add the drained and rinsed chickpeas, arugula, sliced red onion, chopped cucumber, and crumbled Feta cheese in a large salad bowl.
In a small bowl, whisk together the olive oil, lemon juice, chopped parsley, minced garlic, Dijon mustard, salt, and dried oregano until well combined. Drizzle the vinaigrette over the bowl of ingredients.
Gently toss all the ingredients until the salad is evenly coated with the dressing. Serve immediately.
Notes
For optimal freshness, if preparing in advance, keep the vinaigrette separate and mix just before serving to prevent the greens from wilting.