I discovered these silicone portion cubes for the freezer from some friends on a Discord for people with Chronic illnesses and issues. I gotta say, I'm loving this. I've yet to try the other things like veggies, gravies, even pasta that they showed me, but my first two forays are awesome. (more info and links in comments)
I got the two-pack of gumbo and a two-pack of the GOOD marinara at Costco, far more cost effective than Rao's at the regular grocery store. Two of these little cubes are a portion, and one of the gumbo. Not only am I not wasting leftovers in the fridge before I'm in the mood to have it again, I'm only defrosting what I need and not an entire package.