The high heat of a grill means that pounded breasts (paillards) cook in a flash and don't have time to dry out. You can buy thin cutlets, which are pricier, or flatten the chicken yourself, as we do here. (It's up to you whether to save time or money!)
Cooking chicken breasts slowly in simmering water ensures they'll be tender, not rubbery. Onion and salt in the water add flavor without fat. If you have them on hand, you can also toss in a bay leaf, lemon peel, or whole peppercorns.
In restaurants, stir-frying is done in extra-large woks over very high heat. To approximate the effect at home, don't crowd the meat in the pan, and make sure the wok and oil are nice and hot before you add the chicken.
Nuggets are a home run with kids, but admit it, you love them too. These are baked, so you can enjoy them guilt-free. A three-step breading method -- coating chicken pieces in flour, egg, and breadcrumbs -- seals in moisture and gives a crisp crunch without a lot of added fat.