Genesis Theme: Use different image size in CPT Archive page

cpt-setting.php

<?php

function food_recipe_image_size( $image_size ) {
  
  // Only run on the 'image' post type archive
  if( is_post_type_archive( $posttype ) )

    $image_size = 'recipe-thumbs';
  
  return $image_size;
}
add_filter( 'genesis_pre_get_option_image_size', 'food_recipe_image_size', 20 );