Prepare the Drizzle: In a small bowl, whisk together the yogurt and sriracha until smooth. Cover and refrigerate to let the flavors develop.
Preheat & Season Potatoes: Position an oven rack in the center and preheat to 400°F (200°C). In a large bowl, whisk together the cornstarch, garlic powder, 1 teaspoon smoked paprika, and cumin. Add the cubed sweet potatoes and avocado oil, tossing vigorously until every piece is evenly coated.
First Roast: Spread the sweet potatoes on a heavy-duty rimmed baking sheet in a single, even layer. Use two pans if necessary to avoid overcrowding, which helps ensure crispiness. Roast for 20 minutes.
Assemble the Bean Salsa: While the potatoes roast, wipe out the large bowl. Combine the rinsed black beans, coconut aminos, agave, sesame oil, red pepper flakes, and the remaining ½ teaspoon of smoked paprika. Stir well. Gently fold in the red onion, bell pepper, cilantro, minced garlic, ginger, and the lime zest and juice.
Final Roast: Remove the potatoes from the oven, flip them with a spatula, and return to the oven for another 15–20 minutes. They are done when the edges are browned and crisp, and the centers are tender.
Build Your Bowls: Just before serving, gently fold the diced avocado into the bean salsa. Divide the cooked quinoa equally among five bowls. Top with the roasted sweet potatoes and a generous portion of the black bean salsa. Finish with a drizzle of the spicy yogurt sauce and a sprinkle of unsalted pumpkin seeds.