I had the same problem the other day. I had two boneless, skinless chicken breasts in the fridge and had no idea of what I was going to do with them. Meaning I didn't go to the store and plan out preparation. So I just looked around and used what I had.
I decided to make a marinade. I pounded both breasts out to even thickness then placed them in a quart size ziplock bag. I poured in a good amount of olive oil (it's suppose to pull the flavors into the meat), then I gave it a dash of red wine vinegar (I always have this stuff around), then a tablespoon or so of grainy mustard (eyeballed it), then I put it a garlic clove or two, and some thyme sprigs. Then a bit of salt and pepper. I sealed it up tight and let it sit in the fridge for about 6 hours.
I turned my Lodge stovetop cast iron grill on medium high heat and let it heat up for about 8 minutes and grilled the chicken 5-6 minutes per side. Of course turning it 180 after 3 minutes on each side to give it those grill marks. I swear this chicken taste identical to steak. I have never had that happen before. I thought I was crazy so I had my wife taste it. She is a very picky eater by the way, and she even agreed. It tasted just like a medium rare ny strip. Juicy and everything. Could not believe it. I am not even sure if thats exactly how I did the recipe for the marinade, I may have left something out. I know I didn't measure I just eyeballed everything. I would probably never get it close again if I tried. But ****, that is the first time chicken tasted like steak. Amazing.