Heat oil in a Dutch oven over medium-high heat. Add the red onion, garlic, jalapeno if desired, and pepper; cook and stir until tender, 3-5 minutes. Add broth and quinoa. Bring to a boil; reduce heat. Simmer, uncovered, until quinoa is tender, about 10 minutes. Add the chickpeas, beans, tomatoes, corn and cilantro; heat through. If desired, serve with optional ingredients.