The Barnyard Burger is made with a beef patty, bacon, a spicy chicken patty, lettuce, tomato, and cheese, and there are a few different ways to order this secret menu item.
You can try one method, which involves ordering a Spicy Chicken sandwich and a Baconator burger and combining their ingredients to create a Barnyard Burger.
With breaded chicken breast, lettuce, and tomato, the chicken sandwich will be the main shell of the burger while the Baconator brings a beef patty, bacon, ketchup, and cheese.
Another route you can take to get a Barnyard Burger is to ask for an Asiago Ranch Chicken Club (which already has cheese and bacon in it), then request an added hamburger patty.
Finally, you can always try just asking for a Barnyard Burger; chances are that some Wendy's workers might already know what this secret menu item is from past experience.