Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Rinse and pat the chickpeas completely dry, then toss them with half of the olive oil and a pinch of salt.
Spread the chickpeas on the baking sheet and roast for 20-25 minutes until they are golden and crunchy.
Season the chicken breast with salt and pepper, then grill over medium-high heat for about 6 minutes per side until the internal temperature reaches 165°F.
While the chicken and chickpeas cook, whisk together the tahini, lemon juice, and a tablespoon of warm water in a small bowl until the dressing is smooth.
Slice the grilled chicken into thin strips.
Assemble the salad by placing the mixed greens in a large bowl and topping with cucumber, cherry tomatoes, the roasted chickpeas, and the grilled chicken.
Drizzle the lemon-tahini dressing over the top and serve immediately.