This is, for all intents and purposes, a gluten free green bean casserole from scratch. No canned stuff here, man! There are a lot of steps, but they can be done more than one at a time. :) I'm using fresh green beans (since I have an abundance from the garden!!) but if you wanted to use frozen, I guess it won't be the end of the world, just make sure they are really well drained. Frozen will need less time to bake, too. Feel free to sub for a different cheese if you like, just be sure it's real cheese and not a clever lookalike. ;) I also thought bacon would be good, fry it up all crispy and sprinkle on the top before baking (might even use the fat to make the sauce). Oh, man, do I ever love the bacon.