Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them very dry with a clean kitchen towel to ensure they get crispy.
Cut the chicken breast into bite-sized pieces and place them on the baking sheet along with the dried chickpeas.
Drizzle with olive oil and sprinkle with dried oregano, garlic powder, sea salt, and black pepper, tossing well to coat everything evenly.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the chickpeas are golden and crunchy.
While roasting, whisk together the tahini and lemon juice in a small bowl, adding a teaspoon of water at a time until it reaches a drizzling consistency.
Place the baby spinach and sliced cucumber in a bowl, top with the warm roasted chicken and chickpeas, and finish with the creamy tahini dressing.