Combine chopped tomato, salt, and pepper in a bowl; stir well. Cover and chill 1 hour. Combine parsley and next 5 ingredients (parsley through egg) in a another bowl; stir well. Cover and chill 1 hour.
Rub cut sides of garlic over 1 side of each toasted bread slice. Combine tomato mixture and parsley mixture; stir well. Spoon 2 tablespoons tomato-parsley mixture onto each bread slice. Drizzle 1 tablespoon oil over crostini. Serve immediately.