Prep the Beans: If using canned beans, drain and rinse them well. Pat them dry with a paper towel.
Chop the Veggies: Finely chop red onion and parsley. Mince the garlic cloves.
Make the Dressing: In a small bowl, whisk together olive oil, lemon juice, garlic, salt, and pepper.
Mix It All Together: In a large mixing bowl, combine beans, chopped veggies, and dressing. Stir gently.
Let It Chill: Chill the salad in the fridge for at least an hour before serving.
