Heat oven to 400°F Grease an oval 2-quart casserole dish with
tablespoon of the olive oil. Spread potatoes and peppers over bottom of the dish. Season with 1/8 teaspoon each of the salt and pepper. Bake at 400°F for 35 minutes or until potatoes are tender, stirring occasionally.
Scatter garlic over potatoes and peppers. Season fish with remaining 1/8 teaspoon each salt and pepper and place on top of the potatoes. Distribute olives and tomatoes over the casserole. Drizzle with lemon juice and remaining 1 tablespoon olive oil. Sprinkle with parsley.
Bake at 400°F for 25 minutes or until fish flakes easily when tested with a fork.