Preheat and prep: Preheat your oven to 425°F (220°C). Line a rimmed baking sheet with parchment or foil for easy cleanup and even browning. A hot oven encourages caramelization — that sweet, nutty flavor that makes roasted vegetables delicious.

Prepare the vegetables: Cut the red bell pepper into 1-inch pieces, halve the zucchini lengthwise and cut into 1/2-inch half-moons, and slice the red onion into 1/2-inch wedges. Uniform pieces roast evenly; if pieces vary, smaller bits will overcook while larger ones stay underdone.

Toss and season for roasting: Place the chopped vegetables in a bowl and toss with 1 tablespoon of the olive oil, 1/2 teaspoon salt and a few grinds of black pepper. Spread in a single layer on the baking sheet leaving space between pieces so air circulates — crowding traps steam and prevents browning.

Roast the vegetables: Roast on the middle rack for 20–25 minutes, turning once halfway through. Roast until edges are blistered and sugars have caramelized (you want golden-brown bits) — this deepens flavor and adds texture to the salad.

Warm and season the chickpeas: While the vegetables roast, pat the drained chickpeas dry with paper towels to remove excess moisture (this helps them keep their shape and accept dressing). In a skillet over medium heat, warm the chickpeas with a pinch of salt and the ground cumin for 3–4 minutes, shaking the pan occasionally — this 'toasts' the cumin briefly on the chickpeas and layers flavor without needing extra oil.

Make the lemon-tahini dressing: In a small bowl or jar combine the tahini, lemon juice, remaining 1 tablespoon olive oil, 1/4 teaspoon salt, 1/4 tsp freshly ground black pepper and 1–2 tablespoons warm water to loosen. Whisk or shake until smooth and glossy. Add water a little at a time until the dressing is pourable but still creamy. Whisking/tumbling emulsifies the tahini and oil with the acid — creating a silky dressing that coats grains and greens.

Check roasted vegetables: Remove the vegetables from the oven when nicely browned and tender (still with a little bite). Let them cool 3–4 minutes on the sheet — resting concentrates flavors and prevents the salad from wilting the spinach too much.

Assemble the base: In a large bowl, combine the warm cooked quinoa and baby spinach. The warmth from the quinoa will gently wilt the spinach for a tender texture; if you prefer fully crisp greens, cool the quinoa first.

Add chickpeas and vegetables: Add the warmed chickpeas, roasted red pepper, zucchini and red onion to the quinoa-spinach bowl. Toss lightly to combine. Building the salad with warm components keeps the dish inviting and harmonizes textures.

Dress and finish: Pour about three-quarters of the lemon-tahini dressing over the salad and toss to coat, then taste and add more dressing if desired. Sprinkle the chopped parsley and an additional pinch of salt or lemon if needed. Reserving some dressing lets you control the final coating and brightness.

Rest and serve: Let the salad sit 5 minutes before serving so flavors marry. Serve warm or at room temperature. Leftovers keep well and flavors deepen after a few hours in the fridge.

Optional finishing idea: For contrast, top with a drizzle of extra lemon juice or a scattering of toasted sesame seeds or sumac for a bright, tangy finish. These small additions add crunch, aroma and visual interest.