One of my favorite tricks is to, instead of putting a casserole into a 9x13 dish (can I just pause to say WHY did my husband leave the room, with the TV on football, with the remote out of reach? He's a great, phenomenal man, but this is a pet peeve of mine. Remote within reach, please.), to split it into 2 8x8 (or whatever I have on hand, since somehow my glass 8x8 has disappeared) and freeze one. Then, a few weeks down the road, I pull it out, heat it up, and pat myself on the back for being so clever.
Oh, but the only edible part of the 'creamy ham casserole' was the ham. Or the noodles. Depending on who you talk to.