This answer is applicable to general custom classes within Laravel. For a more Blade-specific answer, see Custom Blade Directives in Laravel 5.

Step 1: Create your Helpers (or other custom class) file and give it a matching namespace. Write your class and method:

Step 2: Create an alias:
 [
     ...
        'Helper' => 'App\Helpers\Helper::class',
     ...

Step 3: Use it in your Blade template:


{!! Helper::shout('this is how to use autoloading correctly!!') !!}

Extra Credit: Use this class anywhere in your Laravel app:

Source: http://www.php-fig.org/psr/psr-4/
Why it works: https://github.com/laravel/framework/blob/master/src/Illuminate/Support/ClassLoader.php
Where autoloading originates from: http://php.net/manual/en/language.oop5.autoload.php