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 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 warm tortillas with prepared slaw and flaked tilapia. Drizzle generously with crema. Top with sliced avocado, fresh cilantro leaves, and a squeeze of fresh lime juice.
07 - Arrange assembled tacos on a serving platter with extra lime wedges on the side. Serve immediately while fish is still warm and tortillas retain their texture.