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Download and install the Yoast SEO plugin

Add the Yoast Breadcrumb function to timber context

For Bloom Box, the timber context gets declared in timber.php, inside the add_to_context function

// Add Yoast Breadcrumbs to the context
  if ( function_exists( 'yoast_breadcrumb' ) ) {
      $context['breadcrumbs'] = yoast_breadcrumb('<nav id="breadcrumbs" class="main-breadcrumbs">','</nav>', false );
  }

Add the code to call the breadcrumb function to a template

For Bloom Box, I added it to system/base.twig, inside a block so we can disable it on any templates we don't want to have breadcrumbs

{% block breadcrumbs %}
          {% if breadcrumbs %}
              {{ breadcrumbs }}
          {% endif %} 
      {% endblock %}

In the admin sidebar, under SEO/Search Appearance, enable Breadcrumbs