Summarize:

Throw away all the packaging and place the chicken breasts into a microwavable bowl or platter with raised sides. Plan on thawing 1 to 2 chicken breasts at a time so you don't overcrowd the microwave. It's important to use a dish with sides so that it can catch juices from the defrosting chicken. Program your microwave so it's on a low power setting. Then, place the dish of frozen chicken breasts in it and defrost them for 2 minutes. Don't worry if the chicken breasts are frozen together in a block at this point. If your microwave has a defrost button, you can press it and enter the weight of the chicken breasts. Your microwave should automatically alternate power levels as the chicken thaws. Open the microwave and use tongs to flip each chicken breast over. Then, close the microwave and defrost the chicken for 1 minute to ensure they're completely thawed. If the chicken breasts were frozen together, separate them now and turn them over. Although defrosting chicken in the microwave is convenient, it will cause some of the chicken to start cooking. Be prepared to cook the defrosted chicken breasts as soon as they're done in the microwave to prevent harmful bacteria from growing on the meat. Avoid storing the defrosted chicken breasts in the refrigerator since you need to cook them immediately. If you're going to grill the chicken breasts, consider turning on or lighting the grill before you start defrosting the chicken.
Unwrap the chicken breasts and put them in a microwaveable dish. Defrost the chicken breasts for 2 minutes at 30% power. Flip the breasts and defrost them for 1 more minute. Remove the chicken breasts and cook them straight away.