In a bowl, whisk together lemon juice, olive oil, chopped parsley, basil, salt, and pepper to form the marinade.
Place the chicken breast in a resealable bag or shallow dish and pour half the marinade over it. Let it marinate in the refrigerator for at least 30 minutes.
Preheat the oven to 400°F. Drain and rinse the chickpeas, pat dry, and toss them with a pinch of salt, pepper, and any leftover marinade. Spread them on a baking sheet and roast for about 20-25 minutes until crispy, shaking halfway through.
Meanwhile, grill or pan-sear the marinated chicken breast over medium-high heat for about 6-7 minutes per side, or until fully cooked and juices run clear.
In a large bowl, combine the mixed greens, cherry tomatoes, and cucumber slices.
Slice the cooked chicken and arrange it over the salad. Top with crispy chickpeas.
Drizzle any remaining fresh marinade over the assembled salad and serve immediately.