Turn the chicken with the breast side down.
Cut along both sides of the backbone.
Pull to remove the bone and discard or keep for making chicken stock.
Remove any visible fat.
Turn the chicken over with the breast side up.
Press down on the chicken breast to flatten the whole chicken (the chicken is now butterflied or spatchcocked).
Rub flour with a little water all over the chicken to remove the freshness and slime from the meat.
Rinse the entire chicken thoroughly.
Coat the chicken with fresh green seasoning, salt, pepper, and your additional seasoning options.
Make slits in the chicken breast to ensure the seasonings permeate.
Cover.
Refrigerate and allow the chicken to marinate for at least four hours to overnight.
Preheat the oven to 425°F.
Place the chicken on a baking tray or in a roasting pan with the breast side up.
Add butter to the slits in the chicken breast.
Place rosemary leaves underneath the skin and in the slits.
Tuck the wings underneath the bird.
Bake uncovered at 425°F for 45 minutes or until the thickest part of the breast has an internal temperature of 165ºF and the juices run clear.
Remove from the heat.
Baste the chicken with the drippings.
Leave to sit for 15 minutes or so.
Serve hot.