In a small bowl, combine cumin and next 5 ingredients (through garlic powder).
Sprinkle spice mixture evenly over both sides of fish.
Place fish on a baking sheet coated with cooking spray.
Place fish in pre-heated oven and bake for 9 minutes or until fish flakes easily when tested with a fork.
Remove from oven; place fish in a medium bowl, using a fork, break into pieces.
Heat tortillas, according to package directions.
Divide fish evenly among tortillas; top each with 1/4 cup cabbage and 1 tablespoon crema.