Preheat the oven to 200°C (392°F).
In a bowl, toss diced sweet potatoes with olive oil, cumin, paprika, chili powder, and salt.
Spread evenly on a baking tray and roast for 25 minutes or until tender and caramelized.
Meanwhile, heat a skillet over medium flame.
Add a drizzle of olive oil, then sauté garlic and onion until soft and fragrant.
Stir in the black beans and cook for 3–4 minutes.
In a separate bowl, combine avocado, tomato, red onion, lime juice, coriander, and salt for the salsa.
Warm tortillas on a dry pan or directly over the flame for that toasty edge.
Assemble tacos with a layer of black beans, roasted sweet potatoes, and a spoonful of avocado salsa.
Squeeze lime on top, take a bite, and prepare for flavor fireworks.