Heat oven to 400 degrees F. Grease an oval 2-quart casserole dish with 1 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 degrees 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 degrees F for 25 minutes or until fish flakes easily when tested with a fork.
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