In a medium saucepan, bring the vegetable broth to a boil. Add the quinoa, cover, and reduce the heat to low. Simmer for about 15 minutes or until the quinoa is fluffy and the liquid is absorbed. Remove from heat and let it sit for 5 minutes, then fluff with a fork.
In a large mixing bowl, combine the cooked quinoa, black beans, corn, red bell pepper, diced avocado, red onion, cherry tomatoes, and cilantro.
In a small bowl, whisk together the lime juice, lime zest, cumin, smoked paprika, salt, and pepper. Pour this dressing over the quinoa mixture and toss gently to combine. Adjust seasoning if needed.
To warm the corn tortillas, heat them in a dry skillet over medium heat for about 30 seconds on each side, until they are pliable.
Assemble the tacos by filling each tortilla with a generous scoop of the quinoa mixture.
Serve immediately, garnished with optional toppings such as hot sauce, diced jalapeños, sour cream, or salsa if desired.
Notes
Feel free to customize with your favorite toppings.