In a small bowl, whisk together dressing ingredients: olive oil, red wine vinegar, maple syrup, Dijon mustard, sea salt, oregano, and black pepper. Set aside.
Bring a large salted pot of water to a boil. Meanwhile fill a medium bowl with ice water and set aside. Once water is boiling, add trimmed green beans and stir. Boil green beans until just tender, about 30-60 seconds. Drain green beans and immediately transfer to ice water. Let sit for 2 minutes, then drain.
Add green beans, kidney beans, chickpea, bell peppers, onion, cucumber, tomatoes, basil, and parsley to a large bowl. Drizzle with dressing and toss well to combine. Sprinkle with feta cheese and stir until just mixed.
Serve immediately and enjoy!