In a large bowl, toss the diced sweet potatoes with olive oil, smoked paprika, cumin, garlic powder, minced chipotle peppers, salt, and pepper until well coated.
Spread the sweet potatoes in a single layer on a baking sheet lined with parchment paper. Roast in the preheated oven for 25-30 minutes, or until the sweet potatoes are tender and slightly caramelized, stirring halfway through.
While the sweet potatoes are roasting, heat the corn tortillas on a dry skillet over medium heat for about 30 seconds on each side until warm and pliable.
To assemble the tacos, take a warmed tortilla and layer a few spoonfuls of roasted sweet potatoes down the center. Top with black beans, avocado slices, and red cabbage.
Garnish with fresh cilantro leaves and squeeze fresh lime juice over each taco just before serving.
Serve with extra lime wedges on the side.
Notes
Adjust the number of chipotle peppers based on your spice preference.