Calvados is the famous apple brandy of Normandy, and the bonnes femmes of Normandy often use the spirit to flavor their cooking. But don't feel like you have to buy a bottle of the real thing for this chicken breast recipe. If there's an apple brandy made in your region, reach for that over calvados. As for the apples, use the best locally grown apples you can find. After all, the more local your products, the more true-to-France your cooking will be.