Peel garlic cloves. With side of wide knife smash garlic. For cooking oil, drain 1 tablespoon oil from dried tomatoes; heat the oil in extra-large skillet. Add tomatoes, olives, and garlic to hot oil. Cook 2 to 3 minutes, until garlic is golden. Use slotted spoon to remove tomato-olive mixture. Reserve oil in skillet to cook fish. Set aside tomato-olive mixture.
Rinse and pat dry fish. Season with salt and pepper. Cook fish, skin side down, in hot oil 4 to 6 minutes for each 1/2 inch thickness of fish or until skin is golden and crisp and fish flakes easily when tested with a fork, turning once halfway through cooking. Remove skin, if desired.
To serve, top fish with tomato-olive mixture, cheese, and, if desired, fresh oregano and pepperoncini. Makes 4 servings.