In-N-Out has expanded to 400 locations since opening in 1948, but even though it boasts a stellar menu, you'll likely never see a chicken sandwich.

When rumors spread on TikTok in 2021 that the chain added a chicken sandwich to its secret menu, its corporate office quickly shut down the rumors.

In-N-Out's corporate office told ABC10, "Since 1948, we've served only the freshest, highest quality hamburgers, french fries, and beverages."

It also said, "We remain committed to serving just those menu items in order to allow us to keep our intense focus on the quality of the products we serve."

By sticking to the same-old offerings, In-N-Out prioritizes quality food made with fresh ingredients. This makes it difficult to add new menu items, especially chicken sandwiches.