This can be stored for 5 days in the fridge or for up to 3 months in the freezer. It is good reheated in the oven or even better, this casserole reheats really well in the air fryer - just like fresh! Just fill a small glass bowl or casserole dish with the leftovers and pop it in the air fryer for 5-7 minutes at 350 degrees. The crackers will be crunchy again and the broccoli tender and cheesy!