How to render a view as XML in Laravel 5?

sitemap.index looks like this:

<?php
    use Vanilo\Product\Models\Product;
    header('Content-Type: text/xml');
?>

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">

<?php Product::all()->each(function($product) {
        echo "<url><loc>";
        echo route('product.show', $product);
        echo "</loc><lastmod>";
        echo \Carbon\Carbon::now();
        echo "</lastmod><changefreq>monthly</changefreq><priority>0.8</priority$
}); ?>

</urlset>

web.php looks like this where my route is:

Route::get('/sitemap', function() {
        return view('sitemap.index')->withHeaders([
            'Content-Type' => 'text/xml'
        ]);
});

However, My page comes out like this:

https://evosmedia.uk/shop/p/blk-med-tshirt2019-07-21 08:33:54monthly0.8https://evosmedia.uk/shop/p/small-black-tshirt2019-07-21 08:33:54monthly0.8

How can I render the route as XML?

via Chebli Mohamed