This is the easiest chicken marinade ever. You need:
Boneless, skinless chicken breasts
BBQ sauce (I use regular flavor, but you can get creative and use whatever you want)
That's it. The ratio is 1:1. I use 1/4 a bottle of BBQ sauce and 1/4 a bottle of Italian dressing. Mix together and let the chicken marinate. You can use as many chicken breasts as you want - we usually make 4 or 5, so we can each have one and have some for leftovers the next day. You can use as much (or as little) sauce/dressing marinade as you want. If I've planned well, then I let the chicken marinate over night. But usually I'm not that on top of things, so I let them marinate for like 15 minutes before I am so hungry that I can't stand it anymore. We usually cook them outside on the grill, but they work great in a foreman grill too (in case it's too cold to cook outside). They cook fast, too, so if you're hungry, these make a fast and tasty meal.
I usually make some form of green salad and potatoes to go along (au-gratin, mashed, cheesy, baked - whatever you've got works) and WA-LA ... you've got an entire meal. Yummy!