Prepare all ingredients as directed above.
In a bowl mash the avocado with a fork. Add chopped cilantro, lime juice, garlic powder, salt, and pepper. Mix well. Refrigerate until ready to serve.
Heat the olive oil in a skillet over medium heat. Add the ground beef, cumin, smoked paprika, chili powder, salt, and pepper. Break the beef apart with a spatula and cook until nicely browned, about 5–6 minutes. Add the rinsed black beans to the beef mixture. Cook for an additional 2–3 minutes, stirring occasionally until the beans are heated through.
Optional: Warm the tortillas in a dry skillet over medium heat for 30 seconds per side.
Portion the beef and black bean mixture evenly into the tortillas. Top with shredded cheese, lettuce, diced tomatoes, and a dollop of sour cream or crema if using.
Serve the tacos alongside tortilla chips with guacamole and limeade.