Preheat oven to 350 degrees. Process oil, salt and pepper, lemon juice, garlic, and parsley in a blender until finely chopped. Pour over chicken. Place chicken on lined baking sheet. Bake until chicken reaches an internal temperature of 165 degrees. Remove from oven. Top each breast with a spoonful of marinara sauce and shredded mozzarella. Return to oven until cheese is melted and bubbling.
Serve with pasta and vegetables.