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 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, olive oil, salt, and pepper in a large bowl. 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 creamy.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side or wrap in damp paper towels and microwave for 30 seconds until pliable.
06 - Layer slaw and flaked tilapia onto warm tortillas. Drizzle with crema. Top with sliced avocado, fresh cilantro leaves, and serve with lime wedges on the side.
07 - Serve tacos immediately while fish is warm and tortillas are soft.