Route::group(['middleware' => 'web', 'namespace' => 'Modules\Awesome\Http\Controllers'], function()
{
    Route::get('/shopping/cart', 'ShoppingController@cart');
    // blah blah...
});

Route::get('/shopping/cart', 'ShoppingController@cart');

namespace App\Http\Controllers;

use Modules\Awesome\Http\Controllers\ShoppingController as BaseController;
use Illuminate\Http\Request;

class ShoppingController extends BaseController
{
    function cart(Request $request)
    {
        // 隨你修改商業邏輯 ...

        // 繼續用原有模板與覆蓋機制
        // return view('awesome::shopping.cart');

        // 或是在 resources/views/ 內建一個新的也行
        return view('the-new-cart');
    }
}

namespace Modules\Awesome;

use Illuminate\Database\Eloquent\Model;

class Cart extends Model
{
    // blah ...
}

namespace App;

use Modules\Awesome\Cart as BaseCart;

class Cart extends BaseCart
{
    // blah ...
}