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 fillets evenly with spice mixture. Drizzle with olive oil and lime juice, coating thoroughly.
02 - Heat a large nonstick skillet over medium-high heat. Place seasoned fillets in the hot pan and cook for 3–4 minutes per side until golden brown and fish flakes easily with a fork. Remove from heat and let rest for 2 minutes, then flake into bite-sized pieces.
03 - Combine shredded cabbage, carrots, and chopped cilantro in a large bowl. Add lime juice and olive oil. Season with salt and pepper to taste. Toss thoroughly until all 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 completely smooth and creamy. Adjust seasoning to taste.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side until warm and pliable, or microwave stacked between damp paper towels for 30–45 seconds.
06 - Place a generous portion of slaw on each warm tortilla. Top with flaked tilapia pieces. Drizzle crema generously over the filling. 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 is still warm and tortillas are pliable.