To create these Baja Fish Tacos, follow these simple steps:

1. Prepare the Slaw: In a large mixing bowl, combine the shredded green and red cabbage, grated carrot, and chopped cilantro. In a separate bowl, whisk together the lime juice, olive oil, salt, and pepper. Pour the dressing over the slaw and toss well. Set aside.
2. Prepare the Crema: In a small bowl, mix together sour cream, mayonnaise, lime juice, and chipotle powder if using. Adjust seasoning to taste and set aside.
3. Prepare the Fish: Pat the fish fillets dry with paper towels. Cut into bite-sized pieces or strips.
4. Set Up Breading Station: In one bowl, combine flour, cornmeal, cumin, paprika, salt, black pepper, and cayenne. In another bowl, whisk together eggs and milk.
5. Bread the Fish: Dip fish pieces in the egg mixture, then coat with the flour-cornmeal mixture. Repeat until all pieces are coated.
6. Fry the Fish: In a large skillet, heat vegetable oil over medium-high heat. Once hot, add the fish in batches, frying until golden brown and crispy, about 3-4 minutes per side. Drain on paper towels.
7. Warm Tortillas: In a separate dry skillet, warm each corn tortilla for about 30 seconds on each side until pliable.
8. Assemble the Tacos: Place a few pieces of fried fish onto a tortilla, top with slaw, drizzle with crema, and add any additional toppings like avocado or salsa.
9. Serve Immediately: Enjoy the tacos hot with lime wedges on the side.

By following these steps, you will create an unforgettable Baja Fish Taco experience!