01 - Pat tilapia fillets dry with paper towels. Combine chili powder, cumin, smoked paprika, garlic powder, salt, and black pepper in a small bowl. Rub spice mixture evenly over both sides of fish. Drizzle with olive oil and lime juice, turning to coat.
02 - Heat a large nonstick skillet over medium-high heat. Place seasoned fillets in the pan and cook for 3–4 minutes per side until golden brown and fish flakes easily with a fork. Transfer to a plate 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 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. Refrigerate until ready to serve.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side until pliable and lightly charred. Alternatively, wrap in damp paper towels and microwave in 30-second intervals until warm.
06 - Layer a generous portion of slaw onto each warm tortilla, followed by flaked tilapia. 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 and serve immediately with extra lime wedges on the side.