diff --git a/workspaces/frontend/src/app/pages/WorkspaceKinds/Form/WorkspaceKindForm.tsx b/workspaces/frontend/src/app/pages/WorkspaceKinds/Form/WorkspaceKindForm.tsx
index 0972c68d..d99bdb8e 100644
--- a/workspaces/frontend/src/app/pages/WorkspaceKinds/Form/WorkspaceKindForm.tsx
+++ b/workspaces/frontend/src/app/pages/WorkspaceKinds/Form/WorkspaceKindForm.tsx
@@ -80,7 +80,7 @@ export const WorkspaceKindForm: React.FC = () => {
     // TODO: Complete handleCreate with API call to create a new WS kind
     try {
       if (mode === 'create') {
-        const newWorkspaceKind = await api.createWorkspaceKind({}, yamlValue);
+        const newWorkspaceKind = await api.createWorkspaceKind({ directYAML: true }, yamlValue);
         // TODO: alert user about success
         console.info('New workspace kind created:', JSON.stringify(newWorkspaceKind));
         navigate('workspaceKinds');
diff --git a/workspaces/frontend/src/shared/api/apiUtils.ts b/workspaces/frontend/src/shared/api/apiUtils.ts
index 8930f0dd..09c925e8 100644
--- a/workspaces/frontend/src/shared/api/apiUtils.ts
+++ b/workspaces/frontend/src/shared/api/apiUtils.ts
@@ -19,6 +19,7 @@ export const mergeRequestInit = (
 type CallRestJSONOptions = {
   queryParams?: Record<string, unknown>;
   parseJSON?: boolean;
+  directYAML?: boolean;
 } & EitherOrNone<
   {
     fileContents: string;
@@ -32,7 +33,7 @@ const callRestJSON = <T>(
   host: string,
   path: string,
   requestInit: RequestInit,
-  { data, fileContents, queryParams, parseJSON = true }: CallRestJSONOptions,
+  { data, fileContents, queryParams, parseJSON = true, directYAML = false }: CallRestJSONOptions,
 ): Promise<T> => {
   const { method, ...otherOptions } = requestInit;
 
@@ -54,12 +55,17 @@ const callRestJSON = <T>(
   let contentType: string | undefined;
   let formData: FormData | undefined;
   if (fileContents) {
-    formData = new FormData();
-    formData.append(
-      'uploadfile',
-      new Blob([fileContents], { type: 'application/x-yaml' }),
-      'uploadedFile.yml',
-    );
+    if (directYAML) {
+      requestData = fileContents;
+      contentType = 'application/yaml';
+    } else {
+      formData = new FormData();
+      formData.append(
+        'uploadfile',
+        new Blob([fileContents], { type: 'application/x-yaml' }),
+        'uploadedFile.yml',
+      );
+    }
   } else if (data) {
     // It's OK for contentType and requestData to BOTH be undefined for e.g. a GET request or POST with no body.
     contentType = 'application/json;charset=UTF-8';
@@ -122,6 +128,7 @@ export const restFILE = <T>(
     fileContents,
     queryParams,
     parseJSON: options?.parseJSON,
+    directYAML: options?.directYAML,
   });
 
 /** POST -- but no body data -- targets simple endpoints */
@@ -173,48 +180,6 @@ export const restDELETE = <T>(
     parseJSON: options?.parseJSON,
   });
 
-/** POST -- but with YAML content directly in body */
-export const restYAML = <T>(
-  host: string,
-  path: string,
-  yamlContent: string,
-  queryParams?: Record<string, unknown>,
-  options?: APIOptions,
-): Promise<T> => {
-  const { method, ...otherOptions } = mergeRequestInit(options, { method: 'POST' });
-
-  const sanitizedQueryParams = queryParams
-    ? Object.entries(queryParams).reduce((acc, [key, value]) => {
-        if (value) {
-          return { ...acc, [key]: value };
-        }
-        return acc;
-      }, {})
-    : null;
-
-  const searchParams = sanitizedQueryParams
-    ? new URLSearchParams(sanitizedQueryParams).toString()
-    : null;
-
-  return fetch(`${host}${path}${searchParams ? `?${searchParams}` : ''}`, {
-    ...otherOptions,
-    headers: {
-      ...otherOptions.headers,
-      ...(DEV_MODE && { [AUTH_HEADER]: localStorage.getItem(AUTH_HEADER) }),
-      'Content-Type': 'application/vnd.kubeflow-notebooks.manifest+yaml',
-    },
-    method,
-    body: yamlContent,
-  }).then((response) =>
-    response.text().then((fetchedData) => {
-      if (options?.parseJSON !== false) {
-        return JSON.parse(fetchedData);
-      }
-      return fetchedData;
-    }),
-  );
-};
-
 export const isNotebookResponse = <T>(response: unknown): response is ResponseBody<T> => {
   if (typeof response === 'object' && response !== null) {
     // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
diff --git a/workspaces/frontend/src/shared/api/notebookService.ts b/workspaces/frontend/src/shared/api/notebookService.ts
index 5cdd91bb..8bdaeccc 100644
--- a/workspaces/frontend/src/shared/api/notebookService.ts
+++ b/workspaces/frontend/src/shared/api/notebookService.ts
@@ -1,10 +1,10 @@
 import {
   restCREATE,
   restDELETE,
+  restFILE,
   restGET,
   restPATCH,
   restUPDATE,
-  restYAML,
   wrapRequest,
 } from '~/shared/api/apiUtils';
 import {
@@ -72,7 +72,7 @@ export const getWorkspaceKind: GetWorkspaceKindAPI = (hostPath) => (opts, kind)
   wrapRequest(restGET(hostPath, `/workspacekinds/${kind}`, {}, opts));
 
 export const createWorkspaceKind: CreateWorkspaceKindAPI = (hostPath) => (opts, data) =>
-  wrapRequest(restYAML(hostPath, `/workspacekinds`, data, {}, opts));
+  wrapRequest(restFILE(hostPath, `/workspacekinds`, data, {}, opts));
 
 export const updateWorkspaceKind: UpdateWorkspaceKindAPI = (hostPath) => (opts, kind, data) =>
   wrapRequest(restUPDATE(hostPath, `/workspacekinds/${kind}`, data, {}, opts));
diff --git a/workspaces/frontend/src/shared/api/types.ts b/workspaces/frontend/src/shared/api/types.ts
index 71389f36..7c2bad1a 100644
--- a/workspaces/frontend/src/shared/api/types.ts
+++ b/workspaces/frontend/src/shared/api/types.ts
@@ -3,6 +3,7 @@ export type APIOptions = {
   signal?: AbortSignal;
   parseJSON?: boolean;
   headers?: Record<string, string>;
+  directYAML?: boolean;
 };
 
 export type APIState<T> = {