Rinse the quinoa in a fine-mesh strainer under cold running water. Transfer the quinoa to a 2-quart casserole dish.
Add remaining ingredients through vegetable broth: Add black beans, sweet corn, chili powder, oregano, cumin, paprika, garlic powder, fire-roasted tomatoes, and vegetable broth.
Stir to combine until the quinoa is fully submerged in the vegetable broth.
Cover the dish tightly with aluminum foil. Bake for 25 minutes.
Remove the foil and stir the ingredients to submerge the quinoa. Add more vegetable broth sparingly if the mixture seems dry.
Bake uncovered for another 15 minutes, or until the quinoa is fully cooked.
Season before serving: Add salt and black pepper. Serve with a generous squeeze of fresh lime juice. Garnish with cilantro.
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Notes
If some of the quinoa remains uncooked after 25 minutes of baking, add just enough vegetable broth to submerge the quinoa before baking for an additional 15 minutes.
Choose food brands with the least amount of sodium, and adjust salt to taste for serving.