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diff --git a/web/core/modules/layout_builder/src/Form/AddBlockForm.php b/web/core/modules/layout_builder/src/Form/AddBlockForm.php
new file mode 100644
index 000000000..704d136ba
--- /dev/null
+++ b/web/core/modules/layout_builder/src/Form/AddBlockForm.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace Drupal\layout_builder\Form;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\layout_builder\SectionComponent;
+use Drupal\layout_builder\SectionStorageInterface;
+
+/**
+ * Provides a form to add a block.
+ *
+ * @internal
+ */
+class AddBlockForm extends ConfigureBlockFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'layout_builder_add_block';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function submitLabel() {
+    return $this->t('Add Block');
+  }
+
+  /**
+   * Builds the form for the block.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+   *   The section storage being configured.
+   * @param int $delta
+   *   The delta of the section.
+   * @param string $region
+   *   The region of the block.
+   * @param string|null $plugin_id
+   *   The plugin ID of the block to add.
+   *
+   * @return array
+   *   The form array.
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL, $region = NULL, $plugin_id = NULL) {
+    // Only generate a new component once per form submission.
+    if (!$component = $form_state->getTemporaryValue('layout_builder__component')) {
+      $component = new SectionComponent($this->uuidGenerator->generate(), $region, ['id' => $plugin_id]);
+      $section_storage->getSection($delta)->appendComponent($component);
+      $form_state->setTemporaryValue('layout_builder__component', $component);
+    }
+    return $this->doBuildForm($form, $form_state, $section_storage, $delta, $component);
+  }
+
+}