Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Rinse and drain the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crispiness.
Place the dried chickpeas, broccoli florets, and sliced red bell peppers onto the prepared baking sheet.
Drizzle the vegetables and chickpeas with olive oil and sprinkle with garlic powder, ground cumin, sea salt, and black pepper.
Toss everything together until well-coated and spread into a single even layer on the sheet.
Roast for 20 to 25 minutes, tossing halfway through, until the vegetables are tender and the chickpeas are slightly golden.
While the vegetables roast, whisk together the Greek yogurt, nutritional yeast, and lemon juice in a small bowl until smooth.
Spread the creamy yogurt mixture across the bottom of a serving bowl and top with the warm roasted vegetable and chickpea mixture.