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. Let rest for 2 minutes, then flake into bite-sized pieces.
03 - Combine shredded cabbage, carrots, cilantro, lime juice, olive oil, salt, and pepper in a large bowl. Toss thoroughly to coat all vegetables evenly.
04 - Whisk together sour cream (or Greek yogurt), lime juice, hot sauce if using, and salt in a small bowl until smooth and well combined.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side or microwave between damp paper towels for 20-30 seconds until pliable.
06 - Layer slaw and flaked tilapia onto warmed tortillas. Drizzle generously with crema. Garnish with sliced avocado, fresh cilantro leaves, and a squeeze of fresh lime juice.
07 - Arrange tacos on a serving platter and serve immediately while fish and tortillas are still warm.