Prepare the Drizzle: In a small bowl, whisk together the plant-based yogurt, sriracha, and 2 teaspoons of agave nectar. For the best flavor, cover and chill in the refrigerator while you prepare the other components.
Preheat & Season Potatoes: Position an oven rack in the center and preheat to 400°F (200°C). In a large bowl, combine the cornstarch, garlic powder, smoked paprika, and cumin. Add the cubed sweet potatoes, drizzle with avocado oil, and toss thoroughly until every piece is evenly coated.
First Roast: Spread the seasoned sweet potatoes onto the baking sheet in a single, even layer. Ensure there is space between the cubes to promote crisping rather than steaming. Roast for 20 minutes.
Assemble the Bean Salsa: While the potatoes are in the oven, wipe out the large bowl. Add the rinsed black beans, coconut aminos, 1 tablespoon of agave, sesame oil, and chili crisp. Stir to combine. Gently fold in the chopped red onion, bell pepper, cilantro, minced garlic, grated ginger, and the zest and juice of both limes. Wait to add the avocado until just before serving.
Final Roast: After 20 minutes, remove the baking sheet from the oven. Use a spatula to flip the sweet potato cubes. Return the pan to the oven and roast for another 15-20 minutes, until the edges are deeply caramelized and a fork pierces the cubes with no resistance.
Build Your Bowls: Just before serving, gently fold the diced avocado into the black bean salsa. Divide the cooked quinoa among five bowls. Top with a generous portion of the crispy sweet potatoes and the black bean salsa. Drizzle with the chilled spicy yogurt sauce and finish with a sprinkle of toasted pepitas.