01 - Pat tilapia fillets dry with paper towels. Combine chili powder, cumin, smoked paprika, garlic powder, salt, and black pepper in a small bowl. Season both sides of tilapia with spice mixture, then drizzle with olive oil and lime juice.
02 - Heat a large nonstick skillet over medium-high heat. Cook seasoned fillets for 3-4 minutes per side until golden brown and cooked through. Remove from heat and let rest for 2 minutes, then flake into bite-sized pieces.
03 - Combine shredded cabbage, carrots, cilantro, lime juice, and olive oil in a large bowl. Season with salt and pepper to taste. Toss thoroughly until vegetables are evenly coated.
04 - Whisk together sour cream or Greek yogurt, lime juice, hot sauce, and salt in a small bowl until smooth and creamy. Adjust consistency with a splash of water if needed.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side until pliable and warm. Alternatively, wrap in damp paper towels and microwave for 30-45 seconds.
06 - Layer slaw and flaked tilapia onto warm tortillas. Drizzle generously with crema. Top with sliced avocado, fresh cilantro leaves, and serve with lime wedges on the side.
07 - Arrange tacos on a platter and serve while tortillas are warm and fish is still hot. Pass extra crema and lime wedges at the table.