It's when a chicken breast has been divided into two with one side still intact, creating the visual butterfly effect. Place the chicken breast flat on a cutting board at a 45-degree angle, with the thickest part at the top. u003cbr/u003eu003cbr/u003eHold your whole hand on the chicken breast to hold it steady. Take your knife and begin slicing from the thickest part to the thinnest while keeping the long side of the meat away from you and intact. u003cbr/u003eu003cbr/u003eWhile cutting, you will try to feel where the knife is, ensuring it stays in the center while slicing. Don't worry if you don't get it exactly right on your first try, and practice makes perfect.