Chicken Cordon Bleu is a great make-ahead dish as it freezes very well. Assemble the chicken rolls until the browning stage, and instead of cooking them, wrap them individually in aluminum foil or plastic wrap and store them in a freezer-safe container or in a freezer bag in the freezer for up to 3 months. Fully defrost then follow cooking directions as normal. It is best to make the sauce fresh.u003cbr/u003eAlternatively, leftovers can be stored in the freezer for up to 1 month. Fully defrost before reheating until piping hot. The sauce may not freeze well as it contains dairy.