Combine the quinoa, stock, chipotle, chilli powder, cumin, garlic, onion powder and salt in a medium saucepan. Bring to the boil, reduce heat to low and simmer gently until the quinoa is cooked. About 12-15 minutes. Transfer to a large bowl and leave to cool for 10 minutes.
Meanwhile, make the dressing by combining the dressing ingredients in a medium bowl. Whisk to combine.
Add the black beans, corn, tomatoes, avocado, coriander and pumpkin seeds to the quinoa. Shake to combine. Add dressing and stir to combine.