Siri Reminder to OneNote
Create a list in Reminders called Cortana. Then, say to Siri: "Add Cortana reminder". Your reminder will be sent to the OneNote notebook and section you specify. Note: I used the list name "Cortana" because Siri did not recognize "Add OneNote reminder" correctly (Siri heard "one note" not "OneNote"). You can configure the recipe to use any list name that Siri recognizes.