Cook quinoa according to package instructions using broth. Place 1 cup quinoa and 2 cups broth in medium sauce pot. Bring mixture to a boil and then reduce to a simmer. Cover pot and cook for 12-15 minutes until all the broth has been absorbed by the quinoa. Remove cover and fluff with a fork. Set aside.
In a large bowl, combine black beans, roasted corn, avocado, cherry tomatoes, red onion and jalapeño. Add about half of the lime cilantro ranch dressing. Season with salt and pepper. Toss gently to combine. Set aside.
To serve, distribute cooked quinoa between serving bowls. Top with bean, corn, avocado mixture. Garnish with a dollop of sour cream, a sprinkling of chopped cilantro, and a wedge of lime. Serve with additional lime cilantro ranch dressing on the side.