For meals, you can make chicken and rice, Gluten free pasta (there is such a thing.) You can also have quinoa as a side dish. You can also go to the store and get ideas. I don’t know where you live, but if there’s a whole foods market or a trader joe’s near you, you can go there for ideas.
As a side note,I didn’t even know you can buy xanthan gum. The only way I know about it is by seeing it on ingredients lists on packages.