For best results, let the chicken brine in the buttermilk for at least 4 hours. If pressed for time, you can cut the brining time down to 1 hour and still get good results. You can use our All-Day Red Sauce or our Quick and Easy Red Sauce for this recipe, or a jar of your favorite tomato sauce (we recommend Rao's). For the mozzarella, I recommend the fresh variety available in cryovack containers, not the water-packed variety (which tends to be too moist).