In a large mixing bowl, combine the sweet potatoes, chickpeas, onion, cauliflower and broccoli with olive oil, sea salt, black pepper and garlic powder. Spread the vegetables out onto the prepared pan in an even layer. Roast in the oven for 35-45 minutes, stirring every 15 minutes.
2 sweet potatoes, 1 small onion, 3 cups broccoli florets, 3 cups cauliflower florets, 1 red bell pepper, 1 (15oz) can chickpeas, 2-3 Tablespoons olive oil, 1 teaspoon kosher salt, ¼ teaspoon black pepper, ½ teaspoon garlic powder