diff --git a/plugins/woocommerce-blocks/src/BlockTemplatesController.php b/plugins/woocommerce-blocks/src/BlockTemplatesController.php
index 580b2313eb3..8ad87565472 100644
--- a/plugins/woocommerce-blocks/src/BlockTemplatesController.php
+++ b/plugins/woocommerce-blocks/src/BlockTemplatesController.php
@@ -58,6 +58,7 @@ class BlockTemplatesController {
 		add_filter( 'pre_get_block_template', array( $this, 'maybe_return_blocks_template' ), 10, 3 );
 		add_filter( 'get_block_templates', array( $this, 'add_block_templates' ), 10, 3 );
 		add_filter( 'default_wp_template_part_areas', array( $this, 'add_template_part_areas' ) );
+		add_filter( 'wp_insert_post', array( $this, 'add_mini_cart_content_to_template_part' ), 10, 3 );
 	}
 
 	/**
@@ -298,7 +299,7 @@ class BlockTemplatesController {
 	 *
 	 * @param string[] $slugs An array of slugs to filter templates by. Templates whose slug does not match will not be returned.
 	 * @param array    $already_found_templates Templates that have already been found, these are customised templates that are loaded from the database.
-	 * @param array    $template_type wp_template or wp_template_part.
+	 * @param string   $template_type wp_template or wp_template_part.
 	 *
 	 * @return array Templates from the WooCommerce blocks plugin directory.
 	 */
@@ -399,6 +400,17 @@ class BlockTemplatesController {
 			is_readable( get_stylesheet_directory() . '/block-templates/' . $template_name . '.html' );
 	}
 
+	/**
+	 * Check if the theme has a template. So we know if to load our own in or not.
+	 *
+	 * @param string $template_name name of the template file without .html extension e.g. 'single-product'.
+	 * @return boolean
+	 */
+	public function theme_has_template_part( $template_name ) {
+		return is_readable( get_template_directory() . '/block-template-parts/' . $template_name . '.html' ) ||
+			is_readable( get_stylesheet_directory() . '/block-template-parts/' . $template_name . '.html' );
+	}
+
 	/**
 	 * Checks whether a block template with that name exists in Woo Blocks
 	 *
@@ -472,4 +484,69 @@ class BlockTemplatesController {
 			)
 		);
 	}
+
+	/**
+	 * Add mini cart content block to new template part for Mini Cart area.
+	 *
+	 * @param int      $post_id Post ID.
+	 * @param \WP_Post $post    Post object.
+	 * @param bool     $update  Whether this is an existing post being updated.
+	 */
+	public function add_mini_cart_content_to_template_part( $post_id, $post, $update ) {
+		// We only inject the mini cart content when the template part is created.
+		if ( $update ) {
+			return;
+		}
+
+		// If by somehow, the template part was created with content, bail.
+		if ( ! empty( $post->content ) ) {
+			return;
+		}
+
+		if ( ! function_exists( 'get_block_file_template' ) ) {
+			return;
+		}
+
+		if ( 'wp_template_part' !== $post->post_type ) {
+			return;
+		}
+
+		$type_terms = get_the_terms( $post, 'wp_template_part_area' );
+
+		if ( is_wp_error( $type_terms ) || false === $type_terms ) {
+			return;
+		}
+
+		if ( 'mini-cart' !== $type_terms[0]->name ) {
+			return;
+		}
+
+		// Remove the filter temporarily for wp_update_post below.
+		remove_filter( 'wp_insert_post', array( $this, 'add_mini_cart_content_to_template_part' ), 10, 3 );
+
+		$block_template = null;
+
+		/**
+		 * We only use the mini cart content from file.
+		 */
+		if ( $this->theme_has_template_part( 'mini-cart' ) ) {
+			$template_id    = sprintf( '%s//mini-cart', wp_get_theme()->get_stylesheet() );
+			$block_template = get_block_file_template( $template_id, 'wp_template_part' );
+		} else {
+			$available_templates = $this->get_block_templates_from_woocommerce( array( 'mini-cart' ), array(), 'wp_template_part' );
+			if ( is_array( $available_templates ) && count( $available_templates ) > 0 ) {
+				$block_template = BlockTemplateUtils::gutenberg_build_template_result_from_file( $available_templates[0], $available_templates[0]->type );
+			}
+		}
+
+		if ( is_a( $block_template, 'WP_Block_Template' ) ) {
+			$post->post_content = $block_template->content;
+		} else { // Just for extra safety.
+			$post->post_content = '<!-- wp:woocommerce/mini-cart-contents /-->';
+		}
+
+		wp_update_post( $post );
+
+		add_filter( 'wp_insert_post', array( $this, 'add_mini_cart_content_to_template_part' ), 10, 3 );
+	}
 }