Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Slice the tempeh into bite-sized cubes and dice the red bell pepper into one-inch pieces.
In a large mixing bowl, combine the tempeh, chickpeas, broccoli florets, and bell peppers.
Drizzle the olive oil over the mixture and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing well to coat.
Spread the vegetables and protein in a single layer on the prepared baking sheet and roast for 20 to 25 minutes until the edges are golden and crisp.
While the vegetables roast, whisk together the nonfat Greek yogurt and lemon juice in a small bowl until the sauce is smooth and pourable.
Place the warm cooked quinoa in the base of a serving bowl.
Top the quinoa with the roasted vegetable and tempeh mixture, then finish by drizzling the lemon-yogurt sauce over the entire bowl.