1. Cook the Cilantro Lime Quinoa:
* In a medium saucepan, combine the rinsed quinoa, vegetable broth (or water), olive oil, salt, and pepper.
* Bring to a boil over medium-high heat.
* Once boiling, reduce the heat to low, cover the saucepan, and let it simmer for 15-20 minutes, or until all the liquid has been absorbed and the quinoa is fluffy.
* Remove from heat and let it sit, covered, for 5 minutes.
* Fluff the quinoa with a fork. Stir in the 1/2 cup chopped cilantro and 1/4 cup fresh lime juice. Taste and adjust seasoning if necessary. Set aside.

2. Prepare the Spiced Black Bean Filling:
* While the quinoa is cooking, heat 1 tablespoon of olive oil in a large skillet or pan over medium heat.
* Add the chopped yellow onion and bell pepper (if using). Sauté for 5-7 minutes, until softened and slightly translucent.
* Add the minced garlic and cook for another minute until fragrant, being careful not to burn it.
* Stir in the rinsed and drained black beans, 1/2 cup water (or broth), ground cumin, chili powder, smoked paprika, and cayenne pepper (if using).
* Bring the mixture to a gentle simmer. Reduce the heat to low, cover, and let it cook for 10-12 minutes, stirring occasionally, allowing the flavors to meld. If the mixture becomes too thick, add a little more water or broth.
* Remove from heat. Stir in the 2 tablespoons of fresh lime juice and 1/4 cup chopped cilantro. Season with salt and pepper to taste.

3. Warm the Tortillas:
* You can warm tortillas in a few ways:
* Dry Skillet: Heat a dry skillet (cast iron works great) over medium-high heat. Warm each tortilla for about 30-60 seconds per side, until pliable and slightly charred in spots.
* Oven: Wrap a stack of tortillas in foil and warm them in a 350°F (175°C) oven for about 10-15 minutes.
* Microwave: Wrap a few tortillas in a damp paper towel and microwave for 20-30 seconds, or until warm.

4. Assemble the Tacos:
* Lay out the warm tortillas.
* Spoon a generous amount of the cilantro lime quinoa onto each tortilla.
* Top with a hearty portion of the spiced black bean mixture.
* Add your favorite toppings: shredded lettuce, avocado, salsa, vegan sour cream, etc.
* Serve immediately with extra lime wedges on the side.