diff --git a/src/Flurl.CodeGen/Metadata.cs b/src/Flurl.CodeGen/Metadata.cs
index 0bf9f392..0e5f3067 100644
--- a/src/Flurl.CodeGen/Metadata.cs
+++ b/src/Flurl.CodeGen/Metadata.cs
@@ -125,6 +125,9 @@ public static IEnumerable<ExtensionMethod> GetRequestReturningExtensions(MethodA
 			yield return Create("WithCookies", "Creates a new FlurlRequest and adds name-value pairs to its Cookie header based on property names/values of the provided object, or keys/values if object is a dictionary. " +
 											   "To automatically maintain a cookie \"session\", consider using a CookieJar or CookieSession instead.")
 				.AddArg("values", "object", "Names/values of HTTP cookies to set. Typically an anonymous object or IDictionary.");
+			yield return Create("WithCookies", "Creates a new FlurlRequest and adds name-value pairs to its Cookie header. " +
+			                                   "To automatically maintain a cookie \"session\", consider using a CookieJar or CookieSession instead.")
+				.AddArg("values", "IEnumerable<(string Key, string Value)>", "Names/values of HTTP cookies to set.");
 			yield return Create("WithCookies", "Creates a new FlurlRequest and sets the CookieJar associated with this request, which will be updated with any Set-Cookie headers present in the response and is suitable for reuse in subsequent requests.")
 				.AddArg("cookieJar", "CookieJar", "The CookieJar.");
 			yield return Create("WithCookies", "Creates a new FlurlRequest and associates it with a new CookieJar, which will be updated with any Set-Cookie headers present in the response and is suitable for reuse in subsequent requests.")
diff --git a/src/Flurl.CodeGen/Program.cs b/src/Flurl.CodeGen/Program.cs
index db0da26a..4babfe3f 100644
--- a/src/Flurl.CodeGen/Program.cs
+++ b/src/Flurl.CodeGen/Program.cs
@@ -50,6 +50,7 @@ static int Main(string[] args) {
 					writer
 						.WriteLine("// This file was auto-generated by Flurl.CodeGen. Do not edit directly.")
 						.WriteLine("using System;")
+						.WriteLine("using System.Collections.Generic;")
 						.WriteLine("using System.IO;")
 						.WriteLine("using System.Net;")
 						.WriteLine("using System.Net.Http;")
diff --git a/src/Flurl.Http/CookieExtensions.cs b/src/Flurl.Http/CookieExtensions.cs
index beaa5bab..997f4862 100644
--- a/src/Flurl.Http/CookieExtensions.cs
+++ b/src/Flurl.Http/CookieExtensions.cs
@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using System.Linq;
 using Flurl.Util;
 
@@ -30,15 +31,31 @@ public static IFlurlRequest WithCookie(this IFlurlRequest request, string name,
 		/// <param name="request">The IFlurlRequest.</param>
 		/// <param name="values">Names/values of HTTP cookies to set. Typically an anonymous object or IDictionary.</param>
 		/// <returns>This IFlurlClient.</returns>
-		public static IFlurlRequest WithCookies(this IFlurlRequest request, object values) {
+		public static IFlurlRequest WithCookies(this IFlurlRequest request, object values)
+		{
+			var kvPairs = values.ToKeyValuePairs()
+				.Select(kv => (kv.Key, kv.Value.ToInvariantString()));
+			return request.WithCookies(kvPairs);
+		}
+
+		/// <summary>
+		/// Adds or updates name-value pairs in this request's Cookie header.
+		/// To automatically maintain a cookie "session", consider using a CookieJar or CookieSession instead.
+		/// </summary>
+		/// <param name="request">The IFlurlRequest.</param>
+		/// <param name="values">Names/values of HTTP cookies to set.</param>
+		/// <returns>This IFlurlClient.</returns>
+		public static IFlurlRequest WithCookies(this IFlurlRequest request, IEnumerable<(string Key, string Value)> values)
+		{
 			var cookies = new NameValueList<string>(request.Cookies, true); // cookie names are case-sensitive https://stackoverflow.com/a/11312272/62600
 			// although rare, we need to accommodate the possibility of multiple cookies with the same name
-			foreach (var group in values.ToKeyValuePairs().GroupBy(x => x.Key)) {
+			foreach (var group in values.GroupBy(x => x.Key))
+			{
 				// add or replace the first one (by name)
-				cookies.AddOrReplace(group.Key, group.First().Value.ToInvariantString());
+				cookies.AddOrReplace(group.Key, group.First().Value);
 				// append the rest
 				foreach (var kv in group.Skip(1))
-					cookies.Add(kv.Key, kv.Value.ToInvariantString());
+					cookies.Add(kv.Key, kv.Value);
 			}
 			return request.WithHeader("Cookie", CookieCutter.BuildRequestHeader(cookies));
 		}
diff --git a/src/Flurl.Http/GeneratedExtensions.cs b/src/Flurl.Http/GeneratedExtensions.cs
index 75b39ab3..68806e44 100644
--- a/src/Flurl.Http/GeneratedExtensions.cs
+++ b/src/Flurl.Http/GeneratedExtensions.cs
@@ -1,5 +1,6 @@
 // This file was auto-generated by Flurl.CodeGen. Do not edit directly.
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Net;
 using System.Net.Http;
@@ -632,6 +633,16 @@ public static IFlurlRequest WithCookies(this Url url, object values) {
 			return new FlurlRequest(url).WithCookies(values);
 		}
 		
+		/// <summary>
+		/// Creates a new FlurlRequest and adds name-value pairs to its Cookie header. To automatically maintain a cookie "session", consider using a CookieJar or CookieSession instead.
+		/// </summary>
+		/// <param name="url">This Flurl.Url.</param>
+		/// <param name="values">Names/values of HTTP cookies to set.</param>
+		/// <returns>A new IFlurlRequest.</returns>
+		public static IFlurlRequest WithCookies(this Url url, IEnumerable<(string Key, string Value)> values) {
+			return new FlurlRequest(url).WithCookies(values);
+		}
+		
 		/// <summary>
 		/// Creates a new FlurlRequest and sets the CookieJar associated with this request, which will be updated with any Set-Cookie headers present in the response and is suitable for reuse in subsequent requests.
 		/// </summary>
@@ -1151,6 +1162,16 @@ public static IFlurlRequest WithCookies(this string url, object values) {
 			return new FlurlRequest(url).WithCookies(values);
 		}
 		
+		/// <summary>
+		/// Creates a new FlurlRequest and adds name-value pairs to its Cookie header. To automatically maintain a cookie "session", consider using a CookieJar or CookieSession instead.
+		/// </summary>
+		/// <param name="url">This URL.</param>
+		/// <param name="values">Names/values of HTTP cookies to set.</param>
+		/// <returns>A new IFlurlRequest.</returns>
+		public static IFlurlRequest WithCookies(this string url, IEnumerable<(string Key, string Value)> values) {
+			return new FlurlRequest(url).WithCookies(values);
+		}
+		
 		/// <summary>
 		/// Creates a new FlurlRequest and sets the CookieJar associated with this request, which will be updated with any Set-Cookie headers present in the response and is suitable for reuse in subsequent requests.
 		/// </summary>
@@ -1670,6 +1691,16 @@ public static IFlurlRequest WithCookies(this Uri uri, object values) {
 			return new FlurlRequest(uri).WithCookies(values);
 		}
 		
+		/// <summary>
+		/// Creates a new FlurlRequest and adds name-value pairs to its Cookie header. To automatically maintain a cookie "session", consider using a CookieJar or CookieSession instead.
+		/// </summary>
+		/// <param name="uri">This System.Uri.</param>
+		/// <param name="values">Names/values of HTTP cookies to set.</param>
+		/// <returns>A new IFlurlRequest.</returns>
+		public static IFlurlRequest WithCookies(this Uri uri, IEnumerable<(string Key, string Value)> values) {
+			return new FlurlRequest(uri).WithCookies(values);
+		}
+		
 		/// <summary>
 		/// Creates a new FlurlRequest and sets the CookieJar associated with this request, which will be updated with any Set-Cookie headers present in the response and is suitable for reuse in subsequent requests.
 		/// </summary>