Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Rinse and drain the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they become crispy in the oven.
In a large bowl, combine the dried chickpeas, broccoli florets, and chopped bell peppers.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and dried oregano, tossing until every piece is well-coated.
Spread the mixture in a single layer on the baking sheet and roast for 20 to 25 minutes, tossing halfway through, until the vegetables are tender-crisp.
While roasting, toast the pumpkin seeds in a small dry skillet over medium heat for 3 minutes until they become fragrant and slightly golden.
In a small bowl, whisk together the Greek yogurt and lemon juice until the mixture is smooth and creamy.
To serve, spread the lemon-yogurt mixture across the bottom of a shallow bowl, pile the roasted vegetables on top, and garnish with crumbled feta and toasted seeds.