Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Rinse and drain the chickpeas, then thoroughly pat them dry with a clean kitchen towel to ensure they crisp up in the oven.
Place the chickpeas, broccoli florets, and cauliflower florets on the baking sheet and drizzle with olive oil.
Season with sea salt, black pepper, and garlic powder, tossing well to coat every piece evenly.
Roast for 25 to 30 minutes, tossing halfway through, until the vegetables are tender and the chickpeas are golden brown.
While roasting, whisk the Greek yogurt and lemon juice in a small bowl until the mixture is smooth and pourable.
Spread the tangy yogurt mixture into the base of a shallow bowl and pile the warm roasted vegetables and chickpeas on top.
Garnish with crumbled feta cheese and a sprinkle of hemp seeds before serving.