These cookies keep well for 4–5 days in an airtight container. Add a slice of bread to the container to maintain softness. For freezing, shape dough balls and freeze on a tray; bake straight from frozen with an added minute or two. Swap the nuts, mix in chocolate chips, coconut, or dried fruit, or try a different cereal if desired. Recipe can be made gluten-free with a 1-to-1 gluten-free flour blend—just be sure your oats and cornflakes are gluten-free.