It’s easy:

Bake pizza of your choice in pieces suiting your freezer and your appetite on baking paper.

At half of the normal baking time take those pieces out of the oven, put them onto a paper plate (or don’t, I’m not your mother), and after they cooled down freeze them.

I’d advise to cover the pizza with another piece of kitchen paper and put them into a freezing bag or such before storing them in your personal Arctic.

Feels good to have the best pizza in town as a fast snack for small monies.