Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
In a mixing bowl, combine the drained chickpeas, olive oil, garlic powder, smoked paprika, cumin, salt, and black pepper. Toss until the chickpeas are well coated.
Spread the seasoned chickpeas onto the prepared baking sheet in a single layer.
In the same mixing bowl, add the chopped bell pepper, zucchini, cherry tomatoes, and red onion. Drizzle with a little more olive oil, salt, and pepper, and toss to coat. Spread the vegetables around the chickpeas on the baking sheet.
Roast the chickpeas and vegetables in the preheated oven for 20-30 minutes, or until the chickpeas are golden and crunchy and the vegetables are tender and slightly caramelized. Stir halfway through for even cooking.
While the chickpeas and veggies are roasting, prepare the base for your bowl. Place a handful of spinach or mixed greens in each serving bowl.
Once the chickpeas and veggies are done, remove them from the oven. Spoon the roasted chickpeas and vegetables over the greens in each bowl.
Top each bowl with sliced avocado, and drizzle with tahini or sprinkle with feta cheese or nuts if desired. Serve with lemon wedges for a fresh squeeze of juice.