Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and cut it into bite-sized 1-inch cubes.
In a large mixing bowl, combine the cubed chicken, rinsed chickpeas, broccoli florets, and diced red bell pepper.
Drizzle the olive oil over the mixture and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing until everything is evenly coated.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not overcrowded so they roast properly.
Bake for 20 to 25 minutes, or until the chicken is cooked through and the chickpeas are slightly golden and crisp.
While the tray roasts, whisk together the Greek yogurt and lemon juice in a small bowl until the sauce is smooth and pourable.
Divide the roasted mixture into a bowl and drizzle the creamy lemon yogurt sauce over the top before serving warm.