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. Place seasoned fillets in the pan and cook 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 - In a large bowl, combine shredded cabbage, carrots, chopped cilantro, lime juice, and olive oil. Season with salt and pepper to taste. Toss thoroughly until all vegetables are evenly coated.
04 - In a small bowl, whisk together sour cream (or Greek yogurt), lime juice, hot sauce if using, and salt until smooth and fully combined. Adjust seasoning as needed.
05 - Heat tortillas in a dry skillet over medium heat for 30 seconds per side until warm and pliable, or microwave in batches of 2-3 for 20 seconds.
06 - Place a generous layer of slaw on each warm tortilla, followed by seasoned tilapia pieces. Drizzle with crema sauce and top with sliced avocado, fresh cilantro leaves, and a squeeze of fresh lime juice.
07 - Arrange assembled tacos on a serving platter and serve immediately while tortillas are warm and fish is hot.