Roast the chickpeas: Preheat the oven to 400°F (200°C). Pat the chickpeas dry, then toss them with olive oil, smoked paprika, garlic powder, cumin, salt, and pepper. Spread them in a single layer on a baking sheet and roast for 25–30 minutes, shaking the pan halfway through, until crispy.
Cook the grain: While the chickpeas are roasting, cook the quinoa (or rice) according to the package instructions if it isn't already prepared.
Prepare the vegetables: Dice the cucumber, halve the cherry tomatoes, thinly slice the red onion, chop the parsley, and crumble the feta cheese.
Make the dressing: In a small bowl, whisk together the tahini, lemon juice, olive oil, garlic, maple syrup (if using), salt, and pepper. Gradually whisk in water until the dressing is smooth and pourable.
Assemble the bowls: Divide the quinoa between four bowls. Top with the roasted chickpeas, cucumber, tomatoes, red onion, olives, feta, and parsley.
Serve: Drizzle generously with the lemon tahini dressing and enjoy immediately.