Add the oil to the Instant Pot, hit Sauté, and Adjust so it’s on the More or High setting. After 3 minutes of heating, add the onion, bell pepper, and jalapeño (if using) and sauté for 5 minutes, until lightly softened. Add the garlic and sauté for 1 minute.
Meanwhile, put the quinoa in a fine-mesh strainer and rinse under cold running water for 90 seconds; drain well.
Add the quinoa to the pot and toss until coated in the veggies and oil.
Add the broth, lime juice, black beans, tomatoes, corn (if using), cilantro (if using), cumin, seasoned salt, and chili powder. Stir well.
Secure the lid, move the valve to the sealing position, hit Keep Warm/Cancel, and then hit Manual or Pressure Cook on High Pressure for 1 minute. When done, allow a 10-minute natural release followed by a quick release.
Fluff the quinoa with a fork, stir, and serve topped with additional fresh cilantro and cotija cheese, Parmesan cheese, or nutritional yeast, if desired.