Prepare the seasoning blend by mixing together the garlic powder, onion powder, paprika, ground cumin, salt, and black pepper.
Season the cod (or preferred white fish) with the seasoning blend.
Make the sauce by blending together the sour cream, avocado, jalapeño, garlic cloves, cilantro, lime juice, salt, and pepper. Add water to dilute the sauce if desired.
Prepare the coleslaw by mixing together the red cabbage, green cabbage, mango, jalapeño, cilantro, mayonnaise, lime juice, salt, and pepper.
Cook the seasoned fish in a hot pan or on the grill until blackened and cooked through.
Serve the blackened fish on flour or corn tortillas, topped with the coleslaw and the creamy sauce. Garnish with fresh lime wedges.
