In a bowl, combine the flour, baking powder, garlic powder, onion powder, paprika, and black pepper. Mix well, then gradually add the beer. If needed, add a splash of water to get a smooth, slightly thick batter.

Heat enough oil in a large skillet. Dip the fish strips into the batter and fry over low heat on both sides until golden.

Let the fillets drain. For the sauce, mix the mayonnaise and ground chipotle pepper. To serve, place a fish fillet on a tortilla, top with cabbage, sauce, tomato, and avocado. Enjoy!