diff --git a/src/routes/api/shopping-list/recipe/[recipe_id]/+server.ts b/src/routes/api/shopping-list/recipe/[recipe_id]/+server.ts
new file mode 100644
index 0000000..301b539
--- /dev/null
+++ b/src/routes/api/shopping-list/recipe/[recipe_id]/+server.ts
@@ -0,0 +1,23 @@
+import type { RequestHandler } from './$types';
+import { json } from '@sveltejs/kit';
+import { z } from 'zod';
+import { getDb } from '$lib/server/db';
+import { parsePositiveIntParam, validateBody } from '$lib/server/api-helpers';
+import { removeRecipeFromCart, setCartServings } from '$lib/server/shopping/repository';
+
+const PatchSchema = z.object({
+  servings: z.number().int().min(1).max(50)
+});
+
+export const PATCH: RequestHandler = async ({ params, request }) => {
+  const id = parsePositiveIntParam(params.recipe_id, 'recipe_id');
+  const data = validateBody(await request.json().catch(() => null), PatchSchema);
+  setCartServings(getDb(), id, data.servings);
+  return json({ ok: true });
+};
+
+export const DELETE: RequestHandler = async ({ params }) => {
+  const id = parsePositiveIntParam(params.recipe_id, 'recipe_id');
+  removeRecipeFromCart(getDb(), id);
+  return json({ ok: true });
+};