If you want to make up a bunch of burgers to keep in the freezer and heat up as needed, simply double or triple the recipe given. Bake the burger patties as directed, then let them cool for about 30 minutes. Place the burgers in a freezer bag one at a time with a square of parchment paper between them. Squeeze out as much air as possible, then seal up the bag. When you are ready to eat them, take out as many as needed and reheat them over low heat in a frying pan with a little oil until heated through.