To make chicken cutlets, put a boneless skinless chicken breast on your cutting board, and hold it flat with one hand. Carefully slice the breast in half lengthwise into two even pieces, keeping the knife parallel to the surface of the cutting board. Take each piece and place it in a zip-top bag or between sheets of plastic wrap. Pound the chicken with a meat mallet starting at the center and working to the edges. You want an even thickness of about 1/4 inch. You can check out this tutorial if you need more help.