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.
In a large mixing bowl, combine the chickpeas, broccoli florets, and cauliflower florets with the olive oil, smoked paprika, garlic powder, sea salt, and black pepper.
Spread the vegetables and chickpeas in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 25 to 30 minutes, tossing halfway through, until the vegetables are tender-crisp and the chickpeas are golden and slightly crunchy.
While the vegetables roast, whisk together the Greek yogurt, lemon juice, and nutritional yeast in a small bowl until the sauce is smooth and creamy.
Divide the roasted vegetable and chickpea mixture into bowls.
Drizzle the lemon-yogurt sauce over the top and garnish with hemp hearts and freshly chopped parsley before serving.