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 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 smooth and fully combined. Adjust consistency with a teaspoon of water if needed.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side until pliable and slightly charred. Alternatively, wrap tortillas in damp paper towels and microwave in 30-second intervals until warm.
06 - Layer generous portions of slaw onto each warm tortilla, followed by seasoned tilapia pieces. Drizzle with crema and top with sliced avocado, fresh cilantro leaves, and a squeeze of fresh lime juice.
07 - Arrange tacos on a serving platter with extra lime wedges on the side. Serve while tortillas are warm and fish is still hot for optimal texture and flavor.