Light the grill and leave it on medium high for direct heat grilling. Make sure you clean the grates!
Rinse the chicken breasts under cold running water and then blot dry with paper towels.
Here is the biggest tip. Using a heavy object and some wax paper or plastic wrap, pound the thick end of the chicken breast to flatten the entire breast to an even thickness. This is key to getting an even cooking, tender grilled chicken breast.
Rub the chicken breasts with a little olive oil.
Season you chicken with whatever seasoning you like. This could be as easy a little kosher salt and some fresh ground pepper.
Place the breast on the hottest part of the grill and don't touch them for about 2 - 3 minutes. People always ask us how long to grill chicken. The answer has a lot of variables, but the chicken will actually tell you. As shown in the photo below, you can actually tell that the chicken breast is cooking through, they will get more and more opaque as they cook. Wait until the opaqueness is showing through to the middle of the chicken and then it is time to flip. If you try to flip them too quickly, they will stick to the grill.
Using tongs, lift each breast, rotate 45 degrees and then place them back on the grill. Presentation is half the battle and this will create some impressive grill marks!
After 2 to 4 minutes, lift the chicken breasts with tongs and flip them over.
Grill for 2 more minutes and then rotate again 45 degrees to make our grill marks on this side.
Continue grilling for another 2 to 4 minutes and you should be done! Again, to be sure, use a good instant-read thermometer like the Thermapen, along with our free MeatTemps iPhone app to check the internal temperature of your chicken. For thicker breasts, you may need to close the lid for 5 minutes or so to cook them all of the way through.
Remove the chicken breasts from the grill and place on a plate.