You can (overnight oats), but it's still not crunchy. If you toast the oats first to make them crunchy, it's no longer the dish called "oatmeal" (which is a po

You can (overnight oats), but it's still not crunchy. If you toast the oats first to make them crunchy, it's no longer the dish called "oatmeal" (which is a porridge) but now it's a kind of granola, which can be used as a breakfast cereal.