Measure out the shredded cheddar cheese into a medium-sized freezer bag and seal. Staple the bags together above the seal.
On the day of cooking, take the bag out of the freezer to thaw. Dump the contents of the large bag into a square baking dish. Sprinkle the cheese on top.
This recipe is so versatile. You can add sliced mushrooms, finely cubed ham, crumbled bacon, or diced tomatoes. Whichever flavours you like on your pizza you can add to the casserole.