You can implement the "boot" method of User model, thus the profile is automatically created when a new user is saved.

User.php

class User extends Eloquent implements UserInterface, RemindableInterface {
{
    // ...

    /**
     * The "booting" method of the model.
     *
     * @return void
     */
    public static function boot()
    {
        parent::boot();
        static::created(function($model)
        {
            $profile = new Profile;
            $profile->user_id = $model->id;
            $profile->save();
        });
    }
    // ....
}

How to use

UserController.php

public function postCreate() {
    // ...
    $user->save();
    $user->profile->bio = "new bio";
    $user->profile->save();
}

You don't really need the check $user->Profile ?: new Profile; as they are one-one relations.

If user doesn't exists, even profile won't.