Season the chicken breast with sea salt, black pepper, and dried oregano.
Grill the chicken over medium-high heat for 6-7 minutes per side or until the internal temperature reaches 165°F.
While the chicken rests, rinse and drain the chickpeas, kidney beans, and black beans thoroughly.
In a large mixing bowl, combine the beans with the diced red bell pepper and minced red onion.
In a small bowl, whisk together the lemon juice, extra virgin olive oil, and chopped fresh parsley to create the vinaigrette.
Slice the grilled chicken into thin strips or bite-sized cubes.
Pour the vinaigrette over the bean mixture and toss well to ensure everything is evenly coated.
Plate the bean salad and top with the sliced grilled chicken to serve.