Yes, you can freeze this casserole - I often make two casseroles and freeze one for later. It reheats really well.u003cbr/u003eu003cbr/u003eLeftovers can go into an ovenproof, freezer-proof airtight container. Thaw in the refrigerator and then reheat in the oven at 350F until hot in the middle. Before reheating, you can sprinkle with a little more grated cheese to freshen it up.