01 - Preheat oven to 400°F. Line a baking tray with parchment paper and set aside.
02 - In a bowl, toss cod strips with olive oil, chili powder, smoked paprika, cumin, garlic powder, salt, black 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, or until the fish is opaque throughout and flakes easily when tested 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 until well combined and set aside.
05 - In a small bowl, stir together sour cream or Greek yogurt, lime juice, and lime zest. 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 30 seconds.
07 - Layer slaw onto each warm tortilla, top with flaked baked cod, drizzle with lime crema, and add avocado slices if desired. Garnish with fresh cilantro and serve with lime wedges alongside.