Complain to me if this is not the best and simplest chicken you have ever had:
Have the butcher de-bone Cornish Hens - aka Spring Chicken, aka Poussin, aka a small chicken (1 per person, or maybe 1/2 per person).
Marinate in bottled Italian dressing for around 5 hours or overnight. Try to squash them flat in the marinade. Then squash the boned birds to spread out flat on a charcoal and/or wood fire, season with salt and pepper, several minutes per side, until the skin is crispy.
Never overcook a bird - they dry out. Chicken needs a little pink in the middle of the breast. If you want, you can brush some more vinaigrette on it while grilling.
Serve on a bed of mashed taters with garlic spinach on the side.
De-boning a bird takes practice, but butchers are quick, generally no extra charge. You can do this with a large chicken, but it won't be as good.
My chef friend/advisor says that one should never cook any bird without marinating first, unless it's in a stew.