Combine onion powder,
garlic powder, dry mustard, ground thyme. pepper, & chili;
sprinkle one side of each fillet with half of this mixture.
Coat a large cast iron skillet with cooking spray; place over
medium high heat until hot. Add fillets, seasoned side down, &
cook 4 minutes.
Sprinkle fillets with remaining onion powder mixture; turn
fillets over & cook 3 minutes, or until fillets are blackened &
flake easily when tested with a fork.