We all outline our works differently. Some of us use the snowflake method, or index cards, or mind maps. Some folks do not like to plan and writing the story or project as they progress works best for them. However, my method has been different both in the past and now.
For a few years I have used chapter by chapter summaries in Word to outline. Now, though, I discovered a more effective and quick way to get my stories down. And that is bulleting.
I write the chapter number and bullet the events that happen in each chapter. I check them off one at a time as I complete them.
On the flipside, though, it can be time-consuming to get all the chapter bullets for your whole story, depending on its length or complexity. In fact, I have yet to complete the outline bullets for the nearly second half of my story. I am writing the story and outlining simultaneously. In the past I have outlined the entire story before writing. Or sometimes, I have outlined as I went. I have tried being a pantser rather than a plotter. But planning helps me the best. Writing and planning at the same time is not always easy.
On the bright side, it is easier to follow the bulleted outline and not unintentionally change things. There were a few exceptions for me where I either removed or changed bullet points. But generally, I follow the bulleted events better than the summaries.