Mix paprika, garlic powder, onion powder, cayenne, and oregano
Coat fish generously with spice mixture
Heat a cast-iron skillet over high heat with a bit of oil
Sear fish for 3-4 minutes per side until blackened and cooked through
Break fish into chunks
Mix sour cream with lime juice for crema
Warm tortillas and assemble tacos with fish, cabbage, crema, and cilantro