For juicy, tender baked chicken breasts remember these three things: marinate, bake loosely covered, and use a meat thermometer. In our photos, we show baking 2 chicken breasts, but the marinade shared below is enough for 4 chicken breasts. The chicken does not need to be completely immersed in the marinade, just coated by it. If you plan to double the recipe, simply double the amount of chicken, tomatoes, and the mozzarella.