01 - Preheat oven to 400°F. Line a baking tray with parchment paper.
02 - In a bowl, toss cod fillet strips with olive oil, chili powder, smoked paprika, cumin, garlic powder, salt, pepper, and lime juice until evenly coated. Arrange the seasoned fish in a single layer on the prepared baking tray.
03 - Bake for 12 to 15 minutes until the fish is opaque throughout and flakes easily when pressed with a fork.
04 - While the fish bakes, combine shredded cabbage, carrot, chopped cilantro, lime juice, olive oil, and salt in a mixing bowl. Toss thoroughly and set aside.
05 - Stir together sour cream or Greek yogurt, lime juice, and lime zest in a small bowl. Season with salt and pepper to taste.
06 - Warm tortillas in a dry skillet over medium heat for about 30 seconds per side, or wrap in a damp paper towel and microwave for 20 to 30 seconds.
07 - Layer slaw onto each warm tortilla, top with flaked baked cod, drizzle generously with lime crema, and add sliced avocado if desired. Garnish with fresh cilantro and serve with lime wedges on the side.