Preheat your oven to 400°F.
In a food processor, combine the cooked chickpeas, egg white, chopped onion, garlic, fresh parsley, ground cumin, baking powder, salt, and pepper. Pulse until a coarse, dough-like mixture forms; avoid over-processing for texture.
Form the mixture into small patties and place them on a parchment-lined baking sheet.
Bake the falafel patties in the preheated oven for 20-25 minutes, flipping halfway to ensure even browning and crispiness.
Meanwhile, chop the broccoli, red bell pepper, and zucchini. Toss the vegetables with olive oil, salt, and pepper, and spread on a separate baking tray.
Roast the vegetables in the oven for about 15-20 minutes until tender and slightly charred.
For the lemon-tahini drizzle, whisk together tahini, lemon juice, a pinch of salt, and enough water to achieve a smooth, drizzable consistency.
Plate the crispy falafel alongside a generous serving of roasted vegetables and drizzle the lemon-tahini sauce over the top.
Serve with a side of nonfat Greek yogurt to add a creamy, protein-packed element to the meal.