Season the chicken breast evenly with sea salt, black pepper, and dried oregano.
Heat olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until golden brown and cooked through.
While the chicken rests, whisk together the tahini, lemon juice, water, and minced garlic in a small bowl until the dressing is smooth and creamy.
Roughly chop the romaine lettuce, parsley, and mint; dice the cucumber and red onion, and halve the cherry tomatoes.
In a large salad bowl, combine the chopped greens, fresh herbs, vegetables, and chickpeas.
Slice the rested chicken into thin strips and place them on top of the salad mixture.
Drizzle the lemon-tahini dressing over the salad and toss gently to combine before serving.