To Butterfly the chicken breasts:
1. Place a piece of plastic wrap on cutting board. Then lay the chicken breast over the plastic wrap on cutting board, smooth side down. Remove the tender, refrigerate or freeze for future use.
2. Turn the breast over and place a sharp knife parallel to the cutting board and begin cutting the length of the breast, half widthwise, opening the breast as you cut, just until you get to the other edge without cutting through.
3. Cover opened chicken breasts with plastic wrap. Gently pound chicken breasts with smooth side of mallet until thin and even, being careful not to tear the chicken breast. Repeat with remaining breasts.