Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the tempeh into 1/2-inch cubes to ensure even roasting and maximum surface area for crisping.
In a large mixing bowl, combine the tempeh cubes, chickpeas, and broccoli florets with olive oil, sea salt, and black pepper, tossing until well coated.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring they are not overcrowded.
Roast for 20-25 minutes, tossing halfway through, until the broccoli edges are charred and the tempeh is golden brown.
While the vegetables roast, whisk together the nonfat Greek yogurt, lemon juice, and nutritional yeast in a small bowl until smooth and savory.
Place the warm cooked quinoa in a serving bowl and arrange the roasted vegetables, chickpeas, and tempeh on top.
Garnish the bowl with hemp hearts for extra texture and finish with a generous dollop of the lemon-yogurt sauce.